JP4706595B2 - Radio wave identification device - Google Patents

Description

  The present invention relates to an apparatus for identifying which system receives a radio wave when two different remote control systems such as a smart system and a wireless key system in a vehicle are used in combination.

  2. Description of the Related Art Conventionally, as in Patent Document 1, for example, a remote operation system that controls a function of a vehicle by remote operation is known.

  As this remote operation system, for example, a wireless key system and a smart system are known. In the wireless key system, a lock key for unlocking and unlocking a vehicle door, and an unlock switch for remotely controlling a vehicle door are provided on a vehicle key. The user operates the lock switch to lock the vehicle door, and operates the unlock switch to lock the vehicle door. When these keys are operated, the key transmits a radio wave corresponding to the operated switch to the outside. The radio wave includes unique identification data and data indicating the lock state of the vehicle door.

  The vehicle is provided with a receiver for receiving radio waves from the outside. When a radio wave transmitted from a key is received, the contents of the radio waves are decoded. Thereafter, it is determined whether or not collation is possible whether or not a predetermined relationship is satisfied, such as whether or not the unique identification data included in the radio wave matches the identification data registered in advance. If the vehicle determines that the verification is possible, the vehicle then locks or unlocks the vehicle door based on the data indicating the lock state included in the radio wave. Note that the vehicle does nothing when it is determined that the verification is not successful. This is because it can be determined that the key that transmitted the radio wave is not a legitimate key.

  Note that the time at which radio waves are transmitted from the key is determined based on the user's switch operation, while the receiver does not always receive radio waves, but receives radio waves only at regular intervals. Therefore, the receiver does not always receive the radio wave transmitted from the key from the beginning. Therefore, when the key transmits radio waves, a plurality of radio waves including the same data are transmitted.

  On the other hand, in the smart system, a communication request signal is periodically transmitted from a vehicle-side unit provided in the vehicle. A smart system that transmits a communication request signal based on detecting an operation on a touch sensor or an unlocking switch provided on a vehicle door without periodically transmitting a communication request signal is also known. It has been. When the portable device receives the communication request signal transmitted from the vehicle, the portable device transmits a radio wave including an affirmative signal (hereinafter referred to as an ACK signal) indicating that the mobile device is in a communicable state. Thereafter, communication is alternately performed with the vehicle-side unit. At this time, the portable device transmits radio waves including main data such as identification data unique to the portable device. Note that the data length of the ACK signal is shorter than the data length included in the radio wave transmitted from the key in the above-described wireless key system.

When the vehicle side unit receives the ACK signal, it receives and decodes the radio wave including the main data transmitted from the portable device. Then, it is determined whether or not collation is possible whether or not the identification data unique to the portable device included in the main data satisfies a predetermined relationship, such as whether or not it matches data registered in advance. Here, when it is determined that collation is possible, the door lock state is controlled, or the engine is controlled so that it can be started by operating a dedicated switch. Note that the vehicle unit does nothing if it is determined that the verification is not successful. This is because it can be determined that the portable device that transmitted the radio wave is not a regular portable device.
JP-A-8-332841

  Now, there are vehicles using both the wireless key system and the smart system described above. In this case, on the vehicle side, in order to identify which system the received radio wave is, the same data as the long side data is decoded. Therefore, there is a problem that it takes time to identify which system the received radio wave is.

  This problem is not limited to the case where the wireless key system and the smart system are used together, and it is determined whether the radio wave received by the receiver is one of two different remote control systems. Similarly, when identifying using a radio wave identification device, it may take time to identify radio waves.

  In addition, when radio waves arrive, before the identification of which system's radio wave is received, the radio wave identification devices start to judge radio waves at the same time, and the two radio wave identification devices are operated until a determination result is obtained. There is also a method of continuing the determination operation. However, in this method, one of the radio wave identification devices is operated wastefully, leading to an increase in power consumption, which is a problem.

  The present invention has been made in view of the above problems, and when two different remote control systems are used in combination, the radio wave received by which system is faster and lower in power consumption than in the past. An object of the present invention is to provide a radio wave identification device that can identify whether or not there is any.

  In order to achieve the above object, the radio wave identification device according to claim 1 is a predetermined positive signal indicating that the portable device is in a communicable state in response to a communication request signal transmitted from a predetermined transmitter. , And then, in order from the transmitter, the first system in which the transmitter and the portable device communicate with each other alternately, the data longer than the data length of the positive signal is irrelevant to the communication request signal A radio wave identification device that receives radio waves with the same receiver and identifies which radio wave is received with respect to the second system transmitted to the device, and stores verification data that is the same data as the positive signal Storage means, first decoding means for decoding data included in the radio wave received by the receiver to the same length as the data length of the positive signal, and data decoded by the first decoding means , The above Determining means for determining whether the data is the same as the verification data stored in the means, and the determination means determines that the data decoded by the first decoding means is the same as the verification data The total decoded data length of the data included in the radio wave received by the receiver and the data length decoded by the first decoding means for the data not decoded by the first decoding means The second decoding means for decoding to a data length smaller than the data length included in the radio wave for the second system, and when the second decoding means could not decode the data, the receiver When the received radio wave is identified as the radio wave for the first system and it is determined that the data decoded by the first decoding means is not the same as the identification data, or the second decoding unit There when able to decrypt the data, characterized in that the radio waves received by said receiver and a discrimination means for discriminating a radio wave for the second system.

  According to this, when the receiver receives the radio wave, the first decoding means first decodes the received radio wave up to the same data length as the positive signal transmitted first in the first system. If the decoded data is not the same as the verification data, the received radio wave is not the radio wave for the first system. That is, the received radio wave can be identified as the radio wave for the second system. Therefore, when the data decoded by the first decoding means is not the same as the verification data, the radio wave can be determined by the data length of the positive signal.

  On the other hand, when the data decoded by the first decoding means is the same as the verification data, the second decoding means further decodes the data that has not been decoded by the first decoding means. When the received radio wave is a radio wave for the first system, the radio wave is an affirmative signal transmitted in response to the communication request signal, and thus is the same as the verification data. Also, when the received radio wave is a radio wave for the second system, it may be the same as the verification data. Because the radio wave for the second system is a radio wave transmitted regardless of the communication request signal, even if the radio wave received by the receiver is the radio wave for the second system, the first radio wave included in the radio wave This is because the data happens to be the same as the verification data. Therefore, when the data decoded by the first decoding means is the same as the verification data, at this time, the radio wave received by the receiver cannot be identified as the radio wave for the first system or the radio wave for the second system.

  When the data can be decoded as a result of the decoding by the second decoding means, the received radio wave is identified as the radio wave for the second system. On the other hand, when the second decoding means cannot decode the data, the received radio wave is identified as the radio wave for the first system. In the first system, an affirmative signal is first transmitted from the transmitter, and then, since the portable device and the transmitter alternately transmit and receive data sequentially from the transmitter, the next data is received after receiving the affirmative signal. This is because there is a period in which radio waves are not received before reception. The second decoding means decodes up to a data length in which the total decoded data length with the data length decoded in the first decoding means is smaller than the data length included in the radio wave for the second system.

  As described above, it is possible to identify whether the received radio wave is the radio wave for the first system or the radio wave for the second system without receiving all the radio waves for the first system or the radio waves for the second system. That is, it is possible to quickly identify whether the radio wave is for the first system or the radio wave for the second system, compared to the conventional case.

  In addition, since it is not necessary to operate the two radio wave identification devices at the same time, it is not necessary to operate one of the radio wave identification devices wastefully, and power consumption can be suppressed.

  Hereinafter, an example in which the radio wave identification device according to the present invention is applied to a vehicle in which a smart system and a wireless key system are used together will be described. Therefore, in this embodiment, it is identified whether the radio wave transmitted from the portable device held by the user is the radio wave used in the smart system or the radio key system.

  FIG. 1 is a schematic diagram showing the configuration of a system that uses a smart system and a wireless key system of this embodiment together. Note that the broken line portion in the figure corresponds to the radio wave identification device in the present invention. As shown in the figure, a system using both a smart system and a wireless key system includes a logic IC 10, an ACK reception determination circuit 11, a wireless reception determination circuit 12, a memory 13, a tuner 20, and a CPU 30 provided in the logic IC 10. The transmitter 40 is configured.

  The logic IC 10 supplies power to the transmitter 40 and instructs the transmitter 40 to periodically transmit a communication request signal to the outside. At this time, the tuner 20 is set in a standby state so that radio waves for the smart system and radio waves for the wireless key system transmitted from a portable device (not shown) held by the user can be received.

  The radio wave received by the tuner 20 is transmitted to the ACK reception determination circuit 11 and the wireless reception determination circuit 12. The logic IC 10 transmits the radio wave received by the tuner 20 to the CPU 30 as it is. This is because after the logic IC 10 identifies the received radio wave, the CPU 30 makes a determination as to whether or not the radio wave is a legitimate portable device radio wave and whether or not the subsequent smart system or wireless key system processing is performed.

  The ACK reception determination circuit 11 decodes data transmitted from the tuner 20. In the present embodiment, the ACK signal is an eigenvalue of N bits. Then, based on the decoding result, it is determined whether the received radio wave is a radio wave for the smart system. The processing at this time is a characteristic part of the present invention, and will be described in detail later using a flowchart.

  The wireless reception determination circuit 12 also decodes the data transmitted from the tuner 20. Then, based on the decoding result, it is determined whether the received radio wave is a radio wave for the wireless key system. The processing at this time is a characteristic part of the present invention, and will be described in detail later using a flowchart.

  In the case of a wireless key system, the time at which radio waves are transmitted from the portable device is determined based on the user's switch operation, while the tuner 20 receives radio waves only at regular intervals, not constantly receiving radio waves. do not do. Therefore, the tuner 20 does not always receive a radio wave transmitted from the portable device from the beginning. Therefore, when the portable device transmits radio waves, a plurality of radio waves including the same data are transmitted.

  The memory 13 stores data for checking whether or not the data included in the received radio wave is an ACK signal.

  The reason why the above processing is performed using the logic IC 10 is to suppress power consumption more than when the CPU is used.

  The tuner 20 corresponds to a receiver and receives radio waves for the smart system transmitted from the portable device. It also receives radio waves transmitted from the portable device to the wireless key system. Then, the tuner 20 demodulates the received radio wave and transmits it to the logic IC 10.

  The transmitter 40 periodically generates a communication request signal based on an instruction from the logic IC 10 and transmits it to the outside.

  The radio wave for the smart system is transmitted by the portable device when a communication request signal transmitted from the transmitter 40 is received. At this time, as an electric wave for the smart system, first, an ACK signal (N-bit eigenvalue) indicating that the portable device is in a communicable state is transmitted. When the ACK signal is received by the tuner 20, it is sent to the ACK reception determination circuit 11 and is determined to be an ACK signal by the ACK reception determination circuit. If it is determined that the signal is an ACK signal, the logic IC 10 causes the transmitter 40 to transmit a variable code signal (challenge code) as a randomly generated encryption key. The portable device that has received the challenge code transmits response data generated based on the challenge code. In this way, when an ACK signal is transmitted from the portable device, next, a challenge code is transmitted from the transmitter 40 to the portable device, and response data generated based on the challenge code is transmitted from the portable device to the tuner 20. Is done. Therefore, there is a temporal blank from when the tuner 20 receives the ACK signal until the next radio wave is received. In addition, after transmitting the ACK signal, the portable device transmits main data including an ID code for identifying itself and a control signal related to the smart system.

  On the other hand, the radio wave for the wireless key system is transmitted by a plurality of frames of main data including an ID code and control data instructing locking / unlocking of the vehicle by a switch operation by a user provided in the portable device. That is, the radio wave for the wireless key system is transmitted from the portable device regardless of the communication request signal transmitted from the transmitter 40.

  The data format superimposed on the radio wave for the smart system and the radio wave for the wireless key system is the same.

  The CPU 30 executes various processes related to the smart system and the wireless key system in accordance with a program written in a ROM (not shown). Specifically, when the identification result of the received radio wave is sent from the logic IC 10, whether or not the ID code included in the main data sent from the logic IC 10 matches the ID code stored in advance. For example, it is determined whether or not the predetermined relationship is satisfied.

  When the CPU 30 determines that the ID code can be verified, the CPU 30 sends a signal that allows the engine to start without locking or unlocking the door or inserting a key into the key insertion slot. (Not shown) and an engine ECU (not shown).

  Next, processing performed by the logic IC 10 which is a feature of the present invention will be described based on the flowchart of FIG. The process shown in this flowchart is executed at a constant cycle when a predetermined execution condition is satisfied, such as when the vehicle is stopped and the vehicle door is locked.

  First, in step S9, it is determined whether the tuner 20 has received a radio wave. Here, when the radio wave is not received, a negative determination is made, and this flow is exited. On the other hand, when a radio wave is received, an affirmative determination is made, and the process proceeds to step S10.

  In step S10, it is determined whether the format of the radio wave received by the tuner 20 is a smart system or wireless key system format. Here, when it is determined that the received radio wave is not in the format of the smart system or the wireless key system, a negative determination is made, and in step S11, the CPU 30 transmits information that the received radio wave is not appropriate. In response, the CPU 30 puts itself into a sleep state in order to reduce power consumption. On the other hand, when it is determined that the format of the received radio wave is the format of the smart system or the wireless key system, an affirmative determination is made, and the process proceeds to step S12.

  Step S12 corresponds to the first decryption means, and decrypts the data sent from the tuner 20 by the number of bits of the ACK signal (N bits). This decoding is performed by the ACK reception determination circuit 11 and the wireless reception determination circuit 12. At this time, decoding is performed bit by bit. In step S13, it is determined whether or not the decoding has been completed. If it is determined that the decoding has been completed, an affirmative determination is made, and the process proceeds to step S14. If it is determined that the decoding has not been completed yet, a negative determination is made, and the process returns to step S13 to decode the next bit.

  Step S14 corresponds to determination means, and determines whether or not the first N bits of the data sent from the logic IC 10 are the same as the ACK signal. Specifically, the verification data is read from the memory 13, and the verification is performed by comparing the verification data with the data decoded in step S12. Here, when the decoded data is the same as the ACK signal, it cannot be determined at this time which radio wave has been received. This is because the first N bits of the wireless key system data may be the same as the smart system ACK signal. Therefore, if the first N bits of the data sent from the logic IC 10 are the same as the ACK signal in the smart system, an affirmative determination is made, and the process proceeds to step S15. Otherwise, a negative determination is made, and the process proceeds to step S17. Proceed.

  Step S15 corresponds to the second decryption means, and decrypts from the fifth bit of the data sent from the tuner 20. Next, Step S16 corresponds to the identification means, and determines whether or not the (N + 1) th bit of the identification data sent from the tuner 20 is decryption OK. If it is determined that the decryption is OK, in step S17, the CPU 30 transmits to the CPU 30 that the received radio wave is a radio wave for the wireless key system. Then, the CPU 30 determines whether or not to collate whether or not a predetermined relationship is satisfied, such as whether or not the ID code included in the main data matches the ID code registered in advance. When it is determined that collation is possible, the vehicle door is locked or unlocked with reference to the main data. On the other hand, when it is determined that collation is not possible, the device itself enters a sleep state.

  If it is determined in step S16 that there is no N + 1-th bit of data sent from the logic IC 10, that is, it is determined that the data is decoded NG, the process proceeds to step S18.

  In step S18, the CPU 30 transmits a message indicating that the received radio wave is a radio wave for the smart system. Then, the CPU 30 determines whether or not to collate whether or not a predetermined relationship is satisfied, such as whether or not the ID code included in the main data matches the ID code registered in advance. When it is determined that collation is possible, a permission signal for controlling the locked state of the vehicle door or starting the engine is transmitted to the engine ECU. On the other hand, when it is determined that collation is not possible, the device itself enters a sleep state.

  As described above, in this embodiment, in order to identify whether the received radio wave is a radio wave for the smart system or the radio key system, it is first determined whether the received radio wave is a radio wave for the smart system. Specifically, the first N bits of data sent from the tuner 20 are decoded. If the decoded data is not an ACK signal of the smart system, it is determined that the received radio wave is a radio wave for the wireless key system. On the other hand, when the decoded data is the same as the ACK signal of the smart system, the N + 1-th bit data is continuously decoded. Here, when the data of the (N + 1) th bit cannot be decoded, it is determined that the received radio wave is a radio wave for the smart system. On the other hand, when the data of the (N + 1) th bit can be decoded, it is determined that the received data is a radio wave for the wireless key system.

  Thereby, the received radio wave can be identified quickly and reliably. As a result, power consumption can be suppressed. In particular, when receiving radio waves for the wireless key system, compared to decoding all of the data, in this embodiment, it is possible to identify the radio waves for the wireless key system at the (N + 1) th bit. Can be identified.

  In addition, this invention is not limited to this embodiment, Based on the meaning of this invention, it can implement with a various form. For example, in the above-described embodiment, in step S16, the radio wave is identified based on whether or not the data of the (N + 1) th bit can be decoded with respect to the data transmitted from the logic IC 10, but less than the data used in the wireless key system. If so, the radio wave may be identified by decoding up to any bit. Even in this case, radio waves can be identified more quickly than when all data is decoded. Further, since there is a possibility that the (N + 1) th bit may be deciphered due to noise regardless of the radio wave for the wireless key system, the radio wave identification accuracy is improved by identifying the radio wave with a bit number larger than the N + 1 bit.

  Moreover, in the said embodiment, although radio waves were identified using the logic IC10, you may determine using CPU. In this case, it is preferable to use a CPU with low power consumption.

It is the schematic which shows the structure of the system which used the smart system and wireless key system which concern on this embodiment together. It is a flowchart which shows the process at the time of identifying an electromagnetic wave.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Logic IC, 11 ... ACK reception determination circuit, 12 ... Wireless reception determination circuit, 13 ... Memory, 20 ... Tuner, 30 ... CPU, 40 ... Transmitter

Claims (1)

In response to a communication request signal transmitted from a predetermined transmitter, a predetermined positive signal indicating that the portable device is in a communicable state is first transmitted, and then the transmitter is sequentially transmitted from the transmitter. Radio waves with the same receiver for the first system in which the mobile device and the portable device communicate with each other and the second system in which data longer than the data length of the positive signal is transmitted regardless of the communication request signal Is a radio wave identification device for identifying which radio wave is received,
Storage means for storing verification data of the same data as the positive signal;
First decoding means for decoding data included in the radio wave received by the receiver to the same length as the data length of the positive signal;
Determining means for determining whether or not the data decoded by the first decoding means is the same as the collation data stored in the storage means;
When the determination means determines that the data decoded by the first decoding means is the same as the verification data, the first of the data included in the radio wave received by the receiver Data that has not been decrypted by the decrypting means is decrypted to a data length in which the total decrypted data length with the data length decrypted by the first decrypting means is smaller than the data length included in the radio wave for the second system A second decoding means;
When the second decoding means cannot decode the data, the radio wave received by the receiver is identified as the radio wave for the first system, and the data decoded by the first decoding means is the identification An identification means for discriminating radio waves received by the receiver from radio waves for the second system when it is determined that they are not the same as the data or when the second decoding means can decode the data; A radio wave identification device characterized by.

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