JPH09268820A - Keyless entry system of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the security performance of a keyless entry system by preventing the operation of the keyless entry system in a remote control unit for general use having the learning function. SOLUTION: A counter code region is provided in the ID code data of a keyless entry system 1. The counter code of a remote control unit 2 is counted up by one for each transmission, and the counter code of inquiry of a processing part 11 is counted up by one for each locking/unlocking operation. When the received ID code data is not matched with the ID code data for inquiry only in the counter code region, re-inquiry is performed while the counter code of the ID code data for inquiry is counted up by one. When no matching is obtained even when re-inquiry is performed the prescribed times, the ID code data in which the received ID code data is counted up by one is made the ID code data for inquiry of the processing part 11, and the locking/unlocking operation is retained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyless entry system for remotely locking and unlocking a door of a vehicle, and in particular, a general-purpose remote control unit having a learning function does not operate. It is about the keyless entry system.

[0002]

2. Description of the Related Art In a conventional keyless entry system of this type, a remote control unit and a processing section incorporated in a vehicle body store mutually unique ID code data. When the ID code data stored in the remote control unit is transmitted from the remote control unit to the vehicle body, the processing unit receives the ID code data and the received I
The D code data and the ID code data for its own inquiry are queried, and the door lock is unlocked only when the both match.

Therefore, basically, the remote control unit can be used only in a vehicle dedicated to the remote control unit. However, in recent years, learning control technology in which a computer itself learns an operation method through trial and error has been actively developed, and if such a learning function is added to a remote control unit, ID code data of an unspecified vehicle can be obtained. Learn to make the remote control unit general.

Therefore, there is a possibility that such a general-purpose remote control unit may be misused such as unlocking and stealing another person's vehicle, which may threaten the security performance of the keyless entry system.

Therefore, in a general-purpose remote control unit having a learning function, there is a technical problem to be solved in order to prevent the keyless entry system from operating and to improve the security performance. The purpose is to solve.

[0006]

The present invention has been proposed in order to solve the above-mentioned problems, and ID code data transmitted from a remote control unit and received by a processing unit is In the keyless entry system of the vehicle that locks and unlocks the door of the vehicle when it matches with the ID code data for inquiry of the processing unit, a counter code area is provided in the ID code data, and the remote control unit is provided each time it is transmitted. The counter code of the ID code data of 1 is incremented by 1 and the counter code of the ID code data for inquiry of the processing unit is incremented by 1 each time the locking and unlocking operations are performed. , The ID code data received by the processing unit is compared with the ID code data for inquiry by the counter code. If only the area does not match, the counter code of the ID code data for the inquiry is incremented by 1 and re-inquired. Further, if the re-inquiry does not match even after repeating a predetermined number of times, the received ID code data The present invention provides a keyless entry system for a vehicle in which the ID code data obtained by counting up the counter code by 1 is used as the inquiry ID code data of the processing section, and the locking and unlocking operations are suspended.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. FIG. 1 shows a block diagram of a keyless entry system 1, in which a remote control unit 2 used for carrying is provided with a switch 3, and when the switch 3 is pressed, an ON signal of the switch 3 is input to the control interface 4. It is input to the central management unit 6 via 5.

Then, the central management unit 6 reads the ID code data R stored in the memory 7 and outputs it to the transmitter 9 via the transmission interface 8. As a result, the transmitter 9 transmits the ID code data R.

The ID code data R is shown in FIG.
As illustrated in (a), a fixed code area S _R is divided into left and right and is composed of a large number of bit strings, and an 8-bit counter code area C _R sandwiched between the left and right fixed code areas S _R. It is configured. The bit pattern of the fixed code area S _R is determined at the time of manufacturing the keyless entry system 1 and is not changed thereafter. On the other hand, the bit pattern of the counter code area C _R constitutes a counter code that is incremented by 1 each time it is transmitted, as described later.

Therefore, hereinafter, the counter code area C _R
When displaying the ID code data R in which the bit pattern is specifically specified, a numeral indicating the bit pattern in decimal system is added to the code R as a subscript. For example, the ID code data R of FIG. 2A is displayed as R ₇ .

Then, in FIG. 1, the central control section 6 of the remote control unit 2 which has transmitted the ID code data R based on the ON signal of the switch 3 carries out the transmission operation in parallel with the ID code. The data R is calculated by the calculation unit 10
To load. Then, the arithmetic unit 10 sets 1 to the bit pattern of the counter code area C _R of the ID code data R.
The process of adding is executed. Thus, the counter code of the ID code data R is incremented by 1, and the new ID code data R after the increment is generated.
Is stored in the central management unit 6 and overwritten in the memory 7.

That is, if the transmitted ID code data is R ₇ , the ID code data overwritten in the memory 7 by the count-up after transmission becomes R ₈ . Therefore,
The next time the remote control unit 2 is operated, the ID code data R ₈ will be transmitted.

On the other hand, the processing unit 11 incorporated in the vehicle body
Is provided with a receiver 12. When the receiver 12 receives the ID code data R transmitted from the transmitter 9, the ID code data R is transmitted via the reception interface 14 of the control unit 13. It is sent to the central management unit 15. Then, the central management unit 15 loads the ID code data R into the inquiry unit 16 and also reads the inquiry ID code data P stored in the memory 17, and the ID code data P is also referred to in the inquiry. Part 1
Load to 6.

Here, the ID code data P is shown in FIG.
As (b), the has a fixed code area S _P of the fixed code area S _R of the ID code data R is divided at all to the left and right of the same bit string, and the fixed code area S _R of the left and right Similar to the ID code data R, an 8-bit counter code area C _P is sandwiched between them.

The ID code data R and P are
Fixed code area S of both_RAnd S _PAre the same,
The bit pattern is one keyless entry system
Unique to Mu 1 and multiple keyless entities
Fixed code area S for Lee systems 1, 1 ..._R, S
_PThe bit patterns of do not overlap.

The bit pattern of the counter code area C _P constitutes a counter code which counts up by 1 like the bit pattern of the counter code area C _R. Therefore, the counter code area C _P
When displaying the ID code data P that specifically specifies the bit pattern of
A number marked in the base system is added to the code P as a subscript. That is, in the case of FIG. 2B, the ID code data P is displayed as P ₀ .

Thus, the inquiry unit 16 is loaded with
It is determined whether the two ID code data R and P match. According to the determination result, the central management unit 1 shown in FIG.
The control flow from 5 to the door lock drive circuit 19 via the output interface 18 is executed, or the load and store command from the central management unit 15 to the arithmetic unit 20 is repeated. The specific content will be described with reference to the flowchart of FIG.

First, the processing unit 11 which has been in the reception standby state (step 101) after the initialization processing (step 100).
When the ID code data R is received by (step 10
2) As described above, the inquiry unit 16 determines whether R = P (step 103). And R = P
If so, a command signal is output from the central management unit 15 via the output interface 18, the door lock drive circuit 19 operates, and the door lock operation is executed (step 104).

That is, when the door lock is released, it is locked and when the door lock is released, it is unlocked. In addition, the command signal for unlocking (ID code data) and the command signal for unlocking (ID code data) are distinguished from each other, and the remote control unit 2 is also provided with two switches 3 for locking and unlocking. In some cases, only locking or unlocking may be executed in response to the input of the switch 3.

Then, the ID code data P used for the inquiry is loaded into the arithmetic unit 20 by the central management unit 15, and the counter code of the counter code area C _P is 1
If the new ID code data after the count-up is counted up (the ID code data used for the inquiry is P _n (n is an arbitrary integer), this new ID code data becomes P _{n + 1)} . Is overwritten in the memory 17 (step 105). Then, the processing unit 11 again enters the reception standby state of step 101.

As described above, the ID code data transmitted from the remote control unit 2 is set to R _m (m
Is an arbitrary integer), the ID code data stored in the remote control unit 2 after transmission is R
_{m + 1} . Also, step 103 to step 104
When proceeding to, R _m = P _n , that is, m = n. Therefore, R _{m + 1} = P _{n + 1} .

Therefore, next, when the ID code data R, that is, R _{m + 1} is transmitted from the remote control unit 2, the processing section 11 re-executes the door lock operation of step 104 through steps 102 to 103. The ID code data of the control unit 2 and the processing unit 11 after the re-execution are R _{m + 2} and P _{n + 2} , respectively, and R _{m + 2} = P _{n + 2} .

Thus, the ID code data R and P between the specific remote control unit 2 and the processing section 11 which are in a relative relationship are modified by counting up each counter code each time transmission / reception is performed. Before and after, the ID code data R and P of both IDs have a relation of agreement. Therefore, if this specific remote control unit 2 is used, it is possible to lock and unlock the vehicle in which the opposing processing unit 11 is incorporated.

However, the ID code data R _m transmitted from the remote control unit 2 due to a communication error.
May not be received by the processing unit 11. In such a case, the ID code data of the remote control unit 2 becomes R _{m + 1} , but the ID code data of the processing unit 11 remains in the state of P _n (= R _m ). Even if 2 is operated, R = P does not hold and the door lock does not operate. The flow after step 106 compensates for such a state.

That is, if R ≠ P in step 103, it is further determined in the inquiry section 16 whether the fixed code areas S _R and S _{P of} both ID code data R and P match each other. A determination is made (step 106), and if this is also not the case, the received ID code data is a communication wave for another vehicle, so the process directly returns to the reception standby state of step 101.

On the other hand, if it is determined in step 106 that S _R = S _P , it is considered that there was a communication error as described above in the past, so the following processing is performed. That is, the central management unit 15 uses the ID code data P used for the inquiry.
Is loaded into the arithmetic unit 20 and the counter code is incremented by 1 (step 107). Further, it is confirmed whether or not the count-up count of the step 107 based on the reception of the ID code data R once is the 16th time (step 108).

If it is less than the 16th time, the step is restarted.
Returning to step 103, the inquiry section 16 makes a determination,
The number of ups is 16, or step 103
Until R = P, step 103 → step 107 →
The loop of step 108 → step 103 is repeated.
(Note that the fixed code area S_R, S_PIs the same as
Since it is sufficient to make a determination once based on the reception,
Loop, step 106 is shorted. ) For example, as shown in FIG. 2, the received ID code data is R
₇And the ID code data R₇The original process that received the
The ID code data P is stored in the memory 17 of the processing unit 11. ₀Remember
If so, when the loop is repeated 7 times,
In step 103, R = P (R₇= P₇) Is determined.
Then, the door lock operation of step 104 is performed by this.
Is executed, and further through step 105, step 101
Will be in the standby state.

On the other hand, even if the loop is repeated 16 times, R =
If it does not reach P, that is, if the count-up count reaches 16 in step 108, the inquiry ID code data P is reset and the received ID is received.
The ID code data obtained by counting up the counter code of the code data R by 1 is replaced with the new ID code data P.
Is overwritten in the memory 17 (step 10
9). That is, if the received ID code data is R _m , the ID newly stored in the memory 17 by overwriting.
The code data is P _{m + 1} (= R _{m + 1} ). Then, after that, the reception standby state of step 101 is entered.

Therefore, although the door lock operation is suspended at this stage, the I of the remote control unit 2 is
Since the D code data R is also counted up to R _{m + 1} by the _first operation, if the remote control unit 2 is operated again, the ID code data R _{m + 1}
Is sent. When the processing section 11 receives the ID code data R _{m + 1} , R = P in step 103.
It is determined that (R _{m + 1} = P _{m + 1} ) and the routine proceeds to step 104, where the door lock is operated. In this way, the communication error is compensated and the function of the keyless entry system 1 is maintained.

Then, the specific ID code data R _m is learned from the remote control unit 2 by a general-purpose remote control unit having a learning function,
Consider the case where this is transmitted to the processing unit 11.

In this case, when the ID code data R _m is learned, at least one counter code of the ID code data P stored in the memory 17 of the processing unit 11 is counted up, and P ≠ R _m. It has become.

Therefore, when the learned ID code data R _m is received (step 102), step 103 (→
Step 106) → Step 107 → Step 108 →
After repeating the loop of step 103, step 109
Due to this, the ID code data P is reset, and the same ID code data P = R as R _{m + 1 obtained} by newly incrementing R _m by 1 is stored in the memory 17 of the processing unit 11.
_{m + 1} is written.

Therefore, even if the general-purpose remote control unit is operated again and the learned ID code data R _m is transmitted, the same processing as the first time is repeated and the door lock operation is not executed in step 104. Absent.

Thus, in the general-purpose remote control unit with a learning function, the keyless entry system 1
Therefore, the security performance of the keyless entry system 1 is improved.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0036]

As described above, according to the present invention, by providing the counter code area in the ID code data, the counter code of the ID code data of the remote control unit is incremented by one each time it is transmitted, and I for inquiry of the processing unit every time the lock and unlock operations are performed
The counter code of the D code data is configured to be incremented by one. As a result, if there is no communication error, the ID code data of both the remote control unit and the processing unit will always coincide with each other during transmission and reception, and the door lock will be operated.

Further, when the counter codes of the two do not match due to a communication error, the counter code of the inquiry ID code data is incremented by 1, and the inquiry is made again. The error can be compensated.

Further, in this case, even if the counter code of the inquiry ID code data is counted up a predetermined number of times and it does not match the received ID code data, the door lock operation is suspended, This received I
The ID code data obtained by counting up the counter code of the D code data by 1 is stored in the processing unit as new inquiry ID code data. Therefore, at this point, the ID code data of both the remote control unit and the processing unit match, so that the door lock operation is executed if the remote control unit is operated again.

In this way, the specific remote control unit and the processing unit having a relative relationship function as a keyless entry system as in the conventional case, and the door of the vehicle can be locked and unlocked.

However, in the case of a general-purpose remote control unit having a learning function, even if the ID code data having a certain specific counter code is learned and transmitted, the ID code data for inquiry becomes I learned
Since the counter code is larger than the D code data, the door lock operation is suspended, and the ID code data for inquiry is reset to the ID code data obtained by counting up the counter code of the learned ID code data by one. To be done. Therefore, even if the general-purpose remote control unit with the learning function is operated once again, the door lock is not activated only by repeating the same processing as the first time.

Thus, a general-purpose remote control unit with a learning function cannot support the keyless entry system according to the present invention, and the security performance of the keyless entry system is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2A is an explanatory diagram showing an example of a bit pattern of ID code data of a remote control unit. (B) Explanatory drawing which shows an example of the bit pattern of the ID code data for an inquiry of a process part.

FIG. 3 is a flowchart showing a control flow of a processing unit.

[Explanation of symbols]

1 keyless entry system 2 remote control unit 3 switch 4,13 control unit 6,15 central management unit 7,17 memory 9 transmitter 10,20 arithmetic unit 11 processing unit 12 receiver 16 inquiry unit 19 door lock drive circuit _CR , C _P counter code area S _R , _SP fixed code area R, P ID code data

Claims (1)

[Claims] 1. The ID from the remote control unit
ID sent by the code data and received by the processing unit
When the code data matches the inquiry ID code data of the processing unit, in the keyless entry system of the vehicle that locks and unlocks the door of the vehicle, a counter code area is provided in the ID code data, and each time the transmission is performed , The counter code of the ID code data of the remote control unit is incremented by 1 and the counter code of the ID code data for the inquiry of the processing section is incremented by 1 each time the locking or unlocking operation is performed. On the other hand, when the ID code data received by the processing unit does not match only the counter code area with respect to the inquiry ID code data, the counter code of the inquiry ID code data is incremented by 1. And re-inquired, and when the re-inquiry is not repeated even after repeating a predetermined number of times, it is received. The D code ID code data counter code data was incremented by 1 with the ID code data for inquiry of the processing unit, the vehicle keyless entry system, characterized by holding the 旋錠 and unlocking operations.