JPH10131567A - Keyless entry device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability without reading the regularity of a code transmited from a security body even when the code is intercepted at several times. SOLUTION: The keyless entry device is constituted in such a manner that a keyless entry is realized by communicating an ID code and a rolling code between a security body 20 and a remote controller 10. When a random code transmitted from the security body 20 to the remote controller 10 and a random code received from the remote controller 10 by the security body 20 have specified relationship at that time, door lock is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a keyless entry device.

[0002]

2. Description of the Related Art In a keyless entry device, a remote controller transmits a lock signal and an unlock signal of a door lock to a security body while a remote controller and a security body communicate in one direction or two directions. The door lock is locked and unlocked according to a signal from the remote controller. In two-way communication, the security main body can transmit vehicle information to a remote controller. In a conventional keyless entry device, a remote controller transmits a header, a command, and a rolling code to a security main body. The command indicates the content of an instruction to the security main body, and is a locking signal for unlocking the door, an unlocking signal, and the like. The rolling code is a code whose content changes according to a predetermined rule.

[0003] Then, the remote controller transmits the header, the command, and the rolling code to the security main unit. If the rolling code received by the security main unit is an ID code according to a predetermined rule, the remote control transmits the command received together with the rolling code. The security unit executes the corresponding contents.

[0004]

However, in the above conventional example, the rolling code is a code that changes according to a fixed rule, and is not a complete random shift. When intercepted, the rolling code changes its regularity, which is problematic in that the reliability is low.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a highly reliable keyless entry device which does not break the regularity even if the code transmitted from the security main body is intercepted several times. .

[0006]

SUMMARY OF THE INVENTION The present invention relates to a keyless entry apparatus for realizing keyless entry by exchanging an ID code and a rolling code between a security main unit and a remote controller, and receiving a signal from the remote controller. Each time, a random code generating means for generating a random code, and a main body side transmitting means for transmitting the ID code received from the remote controller, the rolling code, and the random code generated by the random code generating means, The security body has a memory for storing a random code received from the security body, and transmits an ID code of the remote controller, the rolling code, and a random code received from the security body. When the remote controller has a remote controller side transmitting means and the remote controller has a random code transmitted to the remote controller by the security main body, and the random code received by the security main body from the remote controller has a predetermined relationship, It is a keyless entry device that unlocks the door lock.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a keyless entry device KL1 showing one embodiment of the present invention.

The keyless entry device KL1 has a remote controller 10 capable of transmitting and receiving and a security main body 20.

A remote controller 10 capable of transmission and reception
Is a transmission / reception circuit 11, a microcomputer 12, and a lock button 13
, An unlock button 14, a storage circuit 15, and a rolling code generation circuit 16.

The transmission / reception circuit 11 includes a security main unit 20.
A circuit for transmitting and receiving signals to and from the microcomputer 12
Is means for controlling the entire remote controller 10. The lock button 13 is a button pressed when locking the door lock, and the unlock button 14 is a button pressed when unlocking the door lock. The storage circuit 15 includes a security main unit 20.
Is a memory for recording a random code, a header, and an ID code of the remote controller 10 received from the remote controller 10. The rolling code generation circuit 16 is configured based on a predetermined rule.
This is a circuit that generates a rolling code.

The transmitting / receiving circuit 11 and the microcomputer 12 are examples of remote controller-side transmitting means for transmitting an ID code, a rolling code, and a random code received from the security body of the remote controller 10.

The security main unit 20 includes a transmission / reception circuit 21
Microcomputer 22, a random code generation circuit 23,
It has a storage circuit 24 and a door lock mechanism 25.

The transmission / reception circuit 21 is a circuit for transmitting / receiving a signal to / from the remote controller 10 and includes a microcomputer 22
Is means for controlling the entire security main body 20. The random code generation circuit 23 is an example of a random code generation unit that generates a random code every time a signal is received from the remote controller 10. Storage circuit 24
Is a circuit for storing the random code generated by the random code generation circuit 23, and the door lock mechanism 25 is a mechanism for locking and unlocking the door.

The transmitting / receiving circuit 21 and the microcomputer 22 are examples of a main body-side transmitting means for transmitting the ID code, the rolling code, and the random code generated by the random code generating circuit 16 received from the remote controller 10.

The keyless entry device KL1
Means that the security body 20 is the remote controller 10
When the random code transmitted to the security main body 20 and the random code received from the remote controller 10 have a predetermined relationship, the door lock is unlocked.

Next, the operation of the above embodiment will be described.

FIG. 2 is a flowchart showing the operation of the security main unit 20 in the keyless entry device KL1.

First, the security main unit 20 receives a signal from the remote controller 10 (S1), and a random code included in the received signal is transmitted to the security main unit 2.
If it is the same as the new random code transmitted from 0 to the remote controller 10 immediately before (S2), the remote controller 10 can be determined to be a legitimate remote controller. S3) The door lock is closed via the door lock mechanism 25 (S4). If the received command is an unlock signal (S3), the door lock is opened via the door lock mechanism 25 (S5).

On the other hand, if the random code included in the signal received from the remote controller 10 is different from the new random code transmitted immediately before from the security body 20 to the remote controller 10 (S
2) It is determined whether or not it is the same as the random code generated three times in the past (that is, whether it is the same as one of the random codes generated one time, two times, or three times before). (S11) If it is different from the random code generated up to three times before, it can be determined that the remote controller 10 is not a legitimate remote controller, and abnormal processing is performed (S13). For example, the remote controller 1
A signal indicating that normal operation is not performed is transmitted to the remote controller 0, and the remote controller 10 performs abnormal processing such as displaying an abnormal state. In this case, if the door is locked, the locked state is maintained, and if the door is unlocked, the unlocked state is maintained.

Further, the random code transmitted by the security main body 20 to the remote controller 10 up to three times before and the security main body 20
0 is the same as the received random code (S
11) Moreover, when the security main body 20 receives a rolling code 100 times after the rolling code received immediately before by the security main body 20, the security main body 20 receives (S1).
2) Since the remote controller 10 can be determined to be an authorized remote controller, the remote controller 10 executes a locking or unlocking operation according to the received command (S4, S4).
5).

That is, the rolling code is updated each time the operator presses the lock button 13 or the unlock button 14 of the remote controller 10, but if the radio wave condition deteriorates,
The rolling code is not received by the security main body 20, and the rolling code transmitted by the remote controller 10 is updated while the rolling code is not received by the security main body 20. Thereafter, when the radio wave condition becomes good, the security main body 20 can finally receive the rolling code from the remote controller 20, but at this time, the updating of the rolling code has been performed several times, and in order to cope with this, For example, it is checked against the rolling code up to 100 pieces ahead (S12).

In the above embodiment, even if the code transmitted from the security main unit 20 is intercepted several times, the security main unit 20 and the remote controller 10 can be intercepted via the random code generated by the security main unit 20.
Since the renewal is performed, the regularity of the keyless entry device is not overlooked, and the reliability of the keyless entry device is high.

That is, in the above embodiment, when the random code transmitted from the security main body 20 to the remote controller 10 and the random code received from the remote controller 10 by the security main body 20 have a predetermined relationship, the door lock is released. It is a keyless entry device that locks.

The above-mentioned predetermined relationship is a relationship in which the random code transmitted immediately before by the security main body 20 to the remote controller 10 and the random code received by the security main body 20 from the remote controller 10 are the same. Further, the above-mentioned predetermined relationship is a case where the random code transmitted by the security main body 20 to the remote controller 10 before the first predetermined number of times and the random code received by the security main body 20 from the remote controller 10 are the same, In addition, the security main body 20 transmits the rolling code after the second predetermined number of times from the rolling code received immediately before to the security main body 20.
Is received.

FIG. 3 is a diagram for more specifically explaining the operation of the above embodiment.

FIG. 3 shows the operations in ten stages (first to tenth stages) in order. In the first stage, the header H, the ID code ID of the remote controller 10,
Command CD and first rolling code RLC1
The remote controller 10 transmits the first random code RAC1 to the security main unit 20, and the security device 20 normally receives this signal. In response, the random code generation circuit 23 transmits the second random code RAC1 to the second random code RAC1. This shows a state in which a code RAC2 is generated, the generated second random code RAC2 is transmitted by the security main body 20 to the remote controller 10, and the remote controller 10 normally receives the second random code RAC2.

In the second stage, the remote controller 10 transmits the header H, the ID code ID of the remote controller 10, the command CD, the second rolling code RLC2, and the random code RAC2 received from the security main unit 20. And the security body 20
, And the security device 20 normally receives this signal. In response, the random code generation circuit 23 generates a third random code RAC3, and generates the third random code RAC3. 20
Is transmitted to the remote controller 10, but the state of the radio wave is degraded, and the remote controller 10 cannot normally receive the third random code RAC3.

In each of the following stages, the remote controller 10 always transmits the header H, the ID code ID of the remote controller 10, and the command CD (the content of the command may or may not change each time). The following description focuses on the rolling code RLC and the random code RAC.

In the third stage, the remote controller 10
Transmits the third rolling code RLC3 and the random code RAC2 (cannot transmit the random code RAC3 because the random code RAC3 has not been received), and the security main body 20 normally receives them and Although the code RAC4 is transmitted, since the radio wave condition is still poor, the remote controller 10
Cannot receive the random code RAC4.

In the fourth stage, the remote controller 10
Transmits a fourth rolling code RLC4 and a random code RAC2 (random codes RAC3, RAC3).
4 cannot be transmitted because they have not been received), the security main unit 20 normally receives them, transmits a random code RAC5, recovers the radio wave condition, and the remote controller 10 transmits the random code RAC.
5 is received.

In the fifth stage, the remote controller 10
Transmits the fifth rolling code RLC5 and the random code RAC5, but the radio wave condition deteriorates again, and the security main unit 20 cannot receive them properly, does not transmit the random code, and transmits the radio wave condition. Due to the deterioration, the remote controller 10 cannot receive signals. The state similar to the state in the fifth stage is continued until the sixth, seventh, eighth, and ninth stages, and the radio wave state is restored in the tenth stage.

In the tenth step, the remote controller 1
0 transmits the tenth rolling code RLC10 and the random code RAC5,
These are normally received and the random code RAC6 is transmitted.

In the second step, the random code RAC2 transmitted by the security main unit 20 to the remote controller 10 immediately before and the random code RAC2 received by the security main unit 20 from the remote controller 10
2 is the same, the operation according to the command transmitted from the remote controller 10 is performed by the security main unit 2.
0. In the third, fourth, and tenth stages, the security main body 20
The random code transmitted up to three times before 0 and the random code received by the security main unit 20 from the remote controller 10 are the same, and the rolling code 100 times after the rolling code received immediately before by the security main unit 20 is Since the security main body 20 has received the command, an operation according to the command transmitted from the remote controller 10 is executed in the security main body 20.

However, in the fifth, sixth, seventh, eighth, and ninth stages, since the above condition is not satisfied, the operation corresponding to the command transmitted from the remote controller 10 is not executed in the security main unit 20. .

[0035]

According to the present invention, even if the code transmitted from the security main body is intercepted several times, the regularity of the code cannot be seen and the reliability of the keyless entry device is high.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a keyless entry device KL1 showing one embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the security main body 20 in the keyless entry device KL1.

FIG. 3 is a diagram for more specifically explaining the operation of the embodiment.

[Explanation of symbols]

 KL1 Keyless entry device, 10 Remote controller, 16 Rolling code generation circuit, 20 Security body, 23 Random code generation circuit, 25 Door lock mechanism.

Claims (3)

[Claims] 1. A keyless entry device which realizes keyless entry by exchanging an ID code and a rolling code between a security main body and a remote controller, wherein the security main body receives a signal from the remote controller each time. A random code generating means for generating a random code, and a main body side transmitting means for transmitting the ID code received from the remote controller, the rolling code, and the random code generated by the random code generating means, The remote controller transmits a memory for storing a random code received from the security body, an ID code of the remote controller, the rolling code, and a random code received from the security body. A remote controller-side transmitting means, and a door lock when the random code transmitted by the security main body to the remote controller and the random code received by the security main body from the remote controller have a predetermined relationship. A keyless entry device characterized by unlocking. 2. The system according to claim 1, wherein the predetermined relation is that a random code transmitted by the security main body to the remote controller immediately before is the same as a random code received by the security main body from the remote controller. A keyless entry device, characterized in that: 3. The system according to claim 1, wherein the predetermined relation is that a random code transmitted by the security main body to the remote controller up to a first predetermined number of times ago and a random code received by the security main body from the remote controller. A keyless entry device wherein the code is the same, and the security body receives a rolling code that is a second predetermined number of times after the rolling code received immediately before by the security body.