JP2008038522A - Keyless entry device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyless entry device which can notify an owner of a critical moment of stealage. <P>SOLUTION: The keyless entry device functions to transmit/receive a signal composed of a fixed code and a variable code between an in-vehicle device 1 arranged in the vehicle, and a portable unit 2. The in-vehicle device 1 is composed of a storage section 11 for storing therein received information when the fixed code of the signal received from the portable unit 2 is authentic but the variable code is not authentic, and a notifying means 15 responsive to the case where the storage section 11 stores therein the received information, for notifying the owner that the storage section 11 stores the received information. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a keyless entry device that locks / unlocks a door by performing wireless communication between a vehicle-side device and a portable device, and in particular, a keyless entry that can notify that it is a subject of theft. Relates to the device.

Conventionally, a keyless entry device has been known in which a vehicle-side device is provided in a vehicle such as an automobile, and wireless communication is performed with a portable device carried by the driver, and the door is locked / unlocked when authentication is established. It has been. In this case, the signal transmitted from the portable device includes a fixed code including an ID unique to the portable device, and a variable code (rolling code) whose contents change according to a predetermined rule each time it is transmitted. In a vehicle-side device that receives a signal from a portable device, if the fixed code included in the signal includes a pre-registered portable device ID and the variable code has a predetermined content, authentication is established and the door Lock and unlock. An example of such a keyless entry device is disclosed in Patent Document 1.
JP-A-10-131567

  By including a variable code whose contents change with each transmission in the signal transmitted from the portable device, even if the transmission signal is copied, the variable code is valid only once. Since the authentication is not established in this portion, theft by copying the transmission signal can be prevented. However, after the theft is attempted by copying the transmission signal, the theft may eventually be stolen by forced means such as jack-up. In order to prevent this, it is effective to inform the owner that he / she is about to be stolen before being stolen by forced means, but the conventional keyless entry device has such a function. There wasn't.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a keyless entry device capable of notifying the owner that a person is about to be stolen.

In order to solve the above problems, a keyless entry device according to the present invention is a keyless entry device that transmits and receives signals composed of a fixed code and a variable code between a vehicle-side device provided in a vehicle and a portable device.
The vehicle-side device is configured to include a storage unit that stores the received information when the fixed code is normal and the variable code is not normal among signals received from the portable device. Yes.

  The keyless entry device according to the present invention is characterized in that the vehicle is provided with notifying means for notifying that when the storage unit stores the received information.

  Further, the keyless entry device according to the present invention is such that the vehicle includes an ignition switch for turning on the power and starting the engine by a key operation, and the notification means includes the fixed code and the variable code of the signal received from the portable device. In any case, when the ignition switch is operated and the power is turned on, if the reception information is stored in the storage means, the fact is notified.

  According to the keyless entry device according to the present invention, the vehicle-side device includes the storage unit that stores the received information when the fixed code is normal and the variable code is not normal among the signals received from the portable device. Thus, only when a copy of the transmission signal from the portable device is received, it can be recognized that the theft has been attempted and an appropriate notification can be made.

  Further, according to the keyless entry device according to the present invention, the vehicle is provided with notification means for notifying that when the storage unit stores the received information, so that the vehicle owner is surely notified. It can be carried out.

  Further, according to the keyless entry device according to the present invention, the notification means stores when the fixed code and the variable code of the signal received from the portable device are both valid when the ignition switch is operated and the power is turned on. If the received information is stored in the means, the fact that the theft has been attempted can be notified when the engine is next started, so that the notification can be made promptly and reliably. be able to.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a block diagram of a keyless entry device according to this embodiment. As shown in this figure, the keyless entry device according to the present embodiment includes a vehicle-side device 1 provided in a vehicle and a portable device 2 carried by the driver. The vehicle is provided with a receiving antenna 3, while the portable device is provided with a transmitting antenna 4. When the door is locked / unlocked, a signal is transmitted from the portable device 2 to the vehicle-side device 1, and the vehicle-side device 1 performs a predetermined operation according to the signal. .

  The vehicle side device 1 receives a control unit 10 that controls each unit, a memory 11 that stores information related to the ID and reception of the portable device 2, and a signal received from the portable device 3 received by the receiving antenna 3 to the control unit 10. Part 12, an ignition switch 13 for turning the power on and starting the engine by key operation, an engine drive circuit 14 for starting the engine in accordance with the operation of the ignition switch 13, and a theft of the driver in a predetermined case. And an informing means 15 for informing that.

  The portable device 2 includes a control unit 20 that controls each unit, a drive circuit 21 that transmits a signal from the control unit 20 to the transmission antenna 4, and an operation unit 22 that performs a lock / unlock operation. In response to the operation of the operation unit 22, the control unit 20 generates a fixed code including a door locking signal or unlocking signal and the ID of the portable device 2, and a variable code whose contents change according to a predetermined rule. These are transmitted as one signal to the transmission antenna 4 via the drive circuit 21.

  The control unit 10 of the vehicle side device 1 is connected to a memory 11, a receiving unit 12, an ignition switch 13, and a notification unit 15. When the receiving unit 12 receives a transmission signal from the portable device 2 via the receiving antenna 3, the control unit 10 recognizes each of the fixed code and the variable code included in the received signal and determines the ID of the portable device 2 from the memory 11. This is read and compared with the ID of the portable device 2 included in the fixed code. Then, when the ID of the portable device 2 included in the fixed code is normal and the variable code is also normal, the door is locked or unlocked according to the door locking signal or unlocking signal included in the signal. I do.

  The variable code included in the transmission signal from the portable device 2 changes according to a predetermined rule according to the number of signal transmissions. The variable code generation algorithm in the control unit 20 of the portable device 2 is changed to the vehicle-side device 1. The control unit 10 is also provided, and the variable code is updated in both the portable device 2 and the vehicle-side device 1 each time a signal is transmitted from the portable device 2, so that So always authenticate correctly. Actually, since the portable device 2 may be operated unintentionally at a position where the receiving antenna 3 cannot receive the signal, the control unit 10 causes the variable code to be transmitted next to the most recently received variable code. Is determined not only when it is received but also when it is received a signal to be transmitted after a predetermined number of times.

  Next, an operation of performing notification by the notification unit 15 will be described. FIG. 2 shows a flowchart of the notification operation. First, the control unit 10 of the vehicle-side device 1 is in a standby state until it receives a transmission signal from the portable device 2 (S1). When the vehicle-side device 1 receives the transmission signal from the portable device 2, the control unit 10 determines whether or not the received signal is illegal (S2).

  In S <b> 2, the control unit 10 compares the ID included in the fixed code in the transmission signal from the portable device 2 with the ID stored in the memory 11, and determines that the fixed code is authentic if they match. On the contrary, if the ID included in the transmission signal does not match the ID stored in the memory 11, it is determined that the signal is not from the portable device 2 corresponding to the vehicle and returns to the initial state. Do not judge. That is, when noise or a similar signal is received, it is not determined that the signal is an illegal signal.

  When the ID included in the fixed code is valid, the control unit 10 subsequently determines the variable code. Here, as described above, the control unit 10 generates a variable code by an algorithm according to the number of times the signal is transmitted, compares it with the received variable code, and transmits it next to the most recently received variable code. When the power variable code is received or when it is determined that the signal should be transmitted after a predetermined number of times, the variable code is determined to be normal. In the case of the most recently received variable code or a previously received variable code, it is considered that it was operated by a device that copied the signal from the portable device 2 in the past, and in this case, the variable code is invalid. Is determined. If the variable code is normal, the control unit 10 locks or unlocks the door based on the lock signal or the unlock signal included in the transmission signal from the portable device 2.

  In summary, if the fixed code of the transmission signal from the portable device 2 is not normal, the variable code is returned to the initial state without being determined, and the fixed code is normal and variable. When the code is normal, it is determined that the transmission signal from the portable device 2 is normal, the door is locked or unlocked, and the fixed code is normal and the variable code Is not legitimate, it is determined that the transmission signal from the portable device 2 is invalid.

  If it is determined in S2 that the transmission signal from the portable device 2 is illegal, the control unit 10 stores in the memory 11 that the illegal signal has been received (S3). In this state, the control unit 10 waits until the ignition switch 13 is operated (S4).

  When the ignition switch 13 is operated and the power is turned on, if information indicating that an illegal signal is received is stored in the memory 11, the control unit 10 causes the notification means 15 to perform notification ( S5). The notification means 15 may be provided on an instrument panel or the like of the driver's seat and may be formed as a light that lights up or blinks, or may generate sound. Thereby, when the theft is attempted by copying the transmission signal from the portable device 2, the driver can be surely notified when the driver tries to start the engine.

  Although the embodiment of the present invention has been described above, the application of the present invention is not limited to this embodiment, and can be applied in various ways within the scope of its technical idea.

It is a block diagram of the keyless entry device in this embodiment. It is a flowchart of the operation | movement which performs alerting | reporting by an alerting | reporting means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle side apparatus 2 Portable machine 3 Reception antenna 4 Transmission antenna 10 Control part 11 Memory 12 Reception part 13 Ignition switch 15 Notification means 20 Control part

Claims (3)

In a keyless entry device that transmits and receives a signal composed of a fixed code and a variable code between a vehicle-side device provided in a vehicle and a portable device,
The vehicle-side device includes a storage unit that stores the received information when the fixed code is normal and the variable code is not normal among signals received from the portable device. apparatus.   The keyless entry device according to claim 1, wherein the vehicle includes notification means for notifying the storage unit when the storage unit stores reception information.   The vehicle includes an ignition switch that turns on a power source and starts an engine by a key operation, and the notification means operates when the fixed code and the variable code of the signal received from the portable device are both valid. 3. The keyless entry device according to claim 2, wherein when the received information is stored in the storage means when the power is turned on, a notification to that effect is given.

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