JP2000314252A - Keyless entry system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyless entry system to prevent the accidental door opening/closing by a user having the same ID code, and to improve the security. SOLUTION: In this keyless entry system, a transmitter 1 calculates a personal code in accordance with the specified function every operation of an operation switch 5, and the transmission code including the personal code is transmitted from a transmission circuit 10. When the transmission code is received by a reception circuit 15, a receiver calculates the reference code in accordance with the similar function to that on the transmitter 1 side. When the personal code is not matched with the reference code in the receiver 2, an error personal code is regarded as the agreed personal code, and re-registered as the reference code only when the change in the door-locking condition or an ignition switch condition is detected by a door-lock detection switch 20 or an IG key position detection switch 19.

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 used as a key of a vehicle such as an automobile, and more particularly to a keyless entry system which receives a predetermined signal transmitted from a transmitter and locks or unlocks the signal. The present invention relates to a keyless entry system that performs a response operation such as a lock process.

[0002]

2. Description of the Related Art In recent years, a keyless entry system has been developed for opening and closing (locking and unlocking) a lock by transmitting and receiving electromagnetic waves and for instructing operation control of each part. Widely used for Such a keyless entry system includes a transmitter, a receiver, and a lock mechanism, and when the transmitter is operated and a predetermined transmission signal is transmitted and output, the receiver receives the transmission signal. Then, an operation signal based on the output signal is output, and then the lock mechanism performs a predetermined response operation, for example, a lock or unlock process, or starts or stops the engine of the automobile based on the output operation signal. More specifically, in general, a transmitter modulates a predetermined security code, wirelessly transmits and outputs this security code using infrared rays, radio waves, ultrasonic waves, and the like, and a receiver detects a received transmission signal and performs security processing. In this structure, a code is taken out, and an operation signal is output on condition that the code thus taken out and the reference code possessed by itself are matched.

Recently, in order to improve security, use of a keyless entry system using a rolling code or a dynamic code as a personal identification code has been studied. The rolling code and the dynamic code have a code system in which the personal identification code changes every one or several transmissions, and the reference code on the receiver side also changes.

In such a keyless entry system using a rolling code or a dynamic code as a security code, the security code is updated on the transmitter side each time the transmitter is operated, and the security code is updated on the receiver side each time the security code is received. The reference code is updated in accordance with the same rule as the password, and the password and the reference code that match each other change as needed. Thereby, security is improved.

[0005] However, when the receiver does not respond to the operation of the transmitter, for example, when the operation switch of the transmitter is depressed, only the security code is updated. Between them.

[0006] To solve such problems,
Japanese Unexamined Patent Publication No. Hei 8-120987 discloses that when a password in a received transmission code does not match a reference code corresponding to the receiver, for example, the password in error is temporarily stored and retransmitted. When the ID of the transmitted transmission code and the security code coincide with the ID of the receiver and the security code temporarily stored, a keyless entry system having a configuration for re-registering the security code temporarily stored as a reference code is provided. It has been disclosed.

[0007] With this configuration, even when the operation button of the transmitter is pressed and the like and only the personal identification code of the transmitter is updated, whether the transmitter corresponds to a specific receiver is determined. There is an advantage that the determination can be made accurately.

[0008]

However, in the above-mentioned keyless entry system, when a user having the same ID performs remote control within a receivable area, the ID of the retransmitted transmission code and the ID of the receiver are used. If the IDs match, and if the personal identification code and the temporarily stored personal identification code code thereafter, the receiver will erroneously re-register the personal identification code.

The present invention has been made in view of the above circumstances, and provides a keyless entry system capable of preventing accidental opening / closing of a door by another user having the same ID and improving security. With the goal.

[0010]

In order to achieve the above object, according to the present invention, each time an operation switch is operated, a predetermined operation instruction including a password (for example,
A transmitter for transmitting and outputting a transmission code relating to key operation), and outputting an operation signal corresponding to the transmission code on condition that the transmission code is received and a password code of the transmission code matches a reference code. And a receiver, wherein the transmitter updates the security code each time the operation switch is operated, and the receiver updates a reference code each time the transmission code is received, corresponding to the security code. In the keyless entry system, when the password and the reference code do not match, the receiver considers the password as a coincident password when the state of a predetermined operation member on the receiver changes, and sets the reference as a reference. A keyless entry system comprising a control unit for re-registering as a code.

Further, in the invention according to claim 2, the control means considers the password as a matched password when the state of the predetermined operating member changes within a predetermined time, and sets the reference code as a reference code. A keyless entry system characterized by re-registration.

[0012] According to the first and second aspects of the present invention, an error code can be re-registered as a reference code on the receiver side due to a change in the state of a predetermined operation member, whereby the transmitter can be re-registered. Even when the operation button is pressed and the only security code on the transmitter side is updated, it is possible to accurately determine whether a specific transmitter corresponds to the receiver. .

According to a third aspect of the present invention, the control means includes a detection means for detecting a change in the state of the predetermined operation member based on the use of a regular key by the user. System.

According to the third aspect of the present invention, not only the ID but also the regular key possessed by the user is referred to.
Accidental opening and closing of the door by another user of the same ID can be prevented, and security can be improved.

According to a fourth aspect of the present invention, the predetermined operation member is a vehicle door lock or an ignition switch, and the change in the state of the predetermined operation member is that the door is unlocked from a locked state. The keyless entry system is operated from a state, from an unlocked state to a locked state, or from an off state to an on state, or from an on state to an off state. .

According to the fourth aspect of the present invention, it is possible to prevent the accidental opening and closing of the door by another user of the same ID by observing a change in the state of a predetermined operation member due to a regular key operation in a vehicle such as an automobile. Security can be improved.

[0017]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the present embodiment, a configuration example of a keyless entry system used as a key of an automobile will be described. FIG. 1 is a block diagram showing the overall configuration of the keyless entry system according to the present embodiment. In FIG. 1, the keyless entry system includes a transmitter 1, a receiver 2, and a lock mechanism 3.

The transmitter 1 is, for example, a handle portion (not shown) of an automobile key to be inserted into a keyhole of a steering lock.
When the operation switch 5 is operated, a transmission code including a personal identification code is wirelessly transmitted and output using an electromagnetic wave or the like. The receiver 2 is provided on a vehicle side (not shown), for example, near an inner mirror of the vehicle, receives a transmission code transmitted from the transmitter 1, and outputs an operation signal according to the transmission code. It has a configuration. Further, the lock mechanism 3 is configured to lock or unlock the door of the automobile according to the operation signal output from the receiver 2.

As shown in FIG. 1, in the present embodiment, the transmitter 1 is provided with a control unit CPU 6 for executing various arithmetic processing and controlling each unit intensively.
6 is an RO for recording fixed data such as an operation program.
M7 and an EEPROM (electrically erasable read-onlyme
mory) 8 and a RAM 9 which stores variable data and functions as a work area or the like. This EEP
In the ROM, a personal identification code is stored in an updatable manner.
7 stores a transmission code format and a function for updating a predetermined password. In this embodiment,
Updating of the personal identification code is performed based on a predetermined function. However, the present invention is not limited to this. For example, a method of updating the personal identification code using a table having a plurality of personal identification codes and reference codes corresponding thereto may be used. May be performed based on the personal identification code updating method.

In this embodiment, the transmitter is the CP of the control unit.
ROM, RAM and EEPROM as memory means other than U
Although it is configured to include the OM, the structure of the transmitter can be simplified by using a CPU having these memory means, or by using a microcomputer having the CPU and other memory means.

The CPU 6 has an operation switch 5 configured to supply power from the battery 4 to each unit such as the CPU 6 by operating the operation switch, and converts digital data into analog data. Apply modulation,
A transmission circuit 10 which amplifies the signal and transmits and outputs a transmission code as an electromagnetic wave is connected to each other. The operation switch is a push button switch such as a lock switch or an unlock switch which is disposed to be exposed to the outside of the key housing provided with the transmitter.

Similarly to the transmitter 1, the receiver 2 is provided with a CPU 11 corresponding to a control means for executing various arithmetic processes and centrally controlling the respective units. The EEPROM 13 and the RAM 14 are connected. The EEPROM 13 stores a reference code corresponding to the personal identification code of the transmitter 1 in an updatable manner, and the ROM 12 stores an ID code and the same function as that of the transmitter 1 used for updating the reference code. ing. In the present embodiment, the reference code is updated based on the function, but is determined based on the update method of the personal identification code, and is the same value as the personal identification code on the transmitter 1 side or a certain value. Is updated to a value having the relationship

The CPU 11 receives the transmission signal transmitted and output by the transmitter 1, demodulates the received transmission signal, finally converts the demodulated transmission signal into a transmission code of digital data, and inputs the transmission code to the CPU 11. The circuit 15 and an I / F 16 serving as an interface with the lock mechanism 3 are connected to each other.

Further, an input terminal (a and b in the figure) of the receiver 2 has an IG key corresponding to a detection means provided on an ignition key (hereinafter referred to as an IG key) cylinder (not shown). The position detection switch 19 is connected, and an IG key position detection signal indicating the position (ON or OFF) of the IG key inserted into the ignition key cylinder is input. The input terminal of the receiver 2 is connected to a door lock detection switch 20 corresponding to a detection means provided on a key cylinder (not shown) of the door, and a door lock indicating a locked state or an unlocked state of the door. A state detection signal is input. Each unit such as the CPU 11 in the receiver 2 is configured to be supplied with power from the battery 17 of the vehicle.

The lock mechanism 3 is provided with an actuator 18. The actuator 18 drives a lock mechanism (not shown) of the vehicle in accordance with an operation signal output by the receiver 2 to lock or unlock the vehicle. A response operation such as a lock process is performed. The actuator 18 includes an I / F 16 provided in the receiver 2.
It is connected to the.

In such a configuration, when the operation switch 5 of the transmitter 1 is operated, the lock mechanism 3 is remotely operated to lock or unlock the door of the automobile. That is, every time the transmitter 1 operates the operation switch 5, the transmitter 1 calculates (updates) a personal identification code, which is a new rolling code, according to a predetermined function, and transmits a transmission code including the code from the transmission circuit 10. Then, when receiving the transmission code by the receiving circuit 15, the receiver 2 calculates the reference code of the rolling code to be compared with the password code of the transmission code by the above function. Each code in the transmission code is
If it matches the code corresponding to the receiver side,
An operation signal is output from 11 and the actuator 18 of the lock mechanism 3 is driven to perform a response operation such as lock / unlock.

Next, a transmission code used in the keyless entry system will be described. FIG. 2 is a diagram showing a format of a transmission code in the present embodiment.

The transmission code in the first example is shown in FIG.
As shown in (A), it is composed of a custom code, an ID code, a password, a function code, and an end code. As for the transmission code, numerical values other than the password are set in advance. Here, the custom code is a code that differs depending on the manufacturer of the vehicle in which the receiver is mounted, and the ID code and the security code are codes for determining the identity between the transmitter and the receiver. The security code is a code used as a rolling code.
The function code is a code for instructing a function of the vehicle to be executed by operating the transmitter. In the present embodiment, the code is set as a code for instructing locking or unlocking of the key of the vehicle. The end code is a code indicating the end of the transmission code.

The transmission code in the second example is shown in FIG.
As shown in (B), it is composed of a function code, an ID code, a password, and a CRC (Cyclic Redundancy Check) code. Here, the CRC code is a code indicating an error check of the received data. The transmission code is not limited to the configuration as shown in FIG. 2, and various configurations are possible except that the transmission code includes a password that is updated every time an operation switch on the transmitter side is pressed.

Next, the operation of the transmitter 1 will be described. FIG. 3 is a flowchart illustrating an operation procedure on the transmitter side in the present embodiment. In FIG. 3, when the operation switch 5 is operated, the battery 4 is connected to each unit, and power is supplied to each unit (step S1). Then, in step S2, the format of the transmission code stored in the ROM 7 is expanded in the RAM 9, and in step S3, the EE
The personal identification code is loaded from the PROM 8 to the RAM 9.
Next, in step S4, the personal identification code is updated by a predetermined function. Here, the update of the personal identification code is performed based on a predetermined function, but is not limited thereto.

In step S5, a transmission code is created using the updated password, and transmitted to the receiver 2. This transmission code has a configuration including a personal identification code as shown in FIG. 2, and a numerical value is set in advance except for the personal identification code. After sending the transmission code,
The security code stored in the RAM 8 is rewritten and updated with the security code updated in the RAM 9 (step S).
6). In the present embodiment, the update of the personal identification code is performed before the transmission code is created, but may be performed after the transmission code is transmitted. In that case, on the receiver side, the reference code is configured to be updated after being compared with the password.

Next, two embodiments of the operation of the receiver 2 will be described with reference to FIGS. FIG.
FIG. 5 is a flowchart illustrating an operation procedure on the receiver side according to the first embodiment of the present invention, and FIG. 5 is a flowchart illustrating an operation procedure on the receiver side according to the second embodiment of the present invention.

[First Embodiment] As shown in FIG.
In the embodiment, upon receiving the transmission signal transmitted from the transmitter 1 first, the receiver 2 converts the transmission signal, which is analog data, into a transmission code of digital data. Then, when the transmission code is input to the CPU 6 of the receiver 2 (keyless code reception), the process proceeds from step S11 to step S12, where the transmission code frame is checked, that is, the received data is checked for errors (for example, CRC).
Check, checksum, etc.). Step S
If it is determined in step 12 that there is no error in the received data, it is determined that the transmission code has been received, and step S1
Proceed to 3. On the other hand, if it is determined that there is an error, the process returns to step S11, and returns to the standby state until the next transmission code is received.

In step S13, the identity of the ID code on the transmitter side and that on the receiver side are determined. If it is determined that the ID codes match, the process proceeds to step S14, where I
If the D codes do not match, the process returns to step S11. If it is determined in step S14 that the password in the received transmission code matches the updated reference code, the timer is stopped to prevent erroneous registration of the reference code (step S16). It is determined whether a function code indicating a function has been received. If a function code is received, step S18
The lock mechanism 3 operates the actuator 18 based on the operation signal output from the receiver 2 to perform a predetermined response operation on the lock mechanism, that is, lock or unlock processing. When a code other than the code defined in step S17 is received, or in step S1
After a predetermined response operation is performed in step S8, step S1
Return to 1. This is a standby state in which step S11 is repeated until the next transmission code is input, and when there is an input, the operation of step S12 and thereafter is restarted.

The reference code used for comparison with the personal identification code is updated after the transmission code is received. For example, the reference code is loaded from the EEPROM 13 to the RAM 14 and updated by the same function as the transmitter. . Alternatively, it is possible to update the reference code after a series of response operations is completed, and to directly compare the reference code with the reception code when the transmission code is input.

The above is a normal operation in which the personal identification code and the reference code match. Next, when a deviation occurs between the personal identification code and the reference code, that is, in step S14, the personal identification code is changed to the reference code. The operation when it is determined that they do not match will be described in detail.

Since the security code and the reference code function as a rolling code, when the operation switch 5 on the transmitter 1 side is depressed, only the security code is updated, and the password between the security code and the reference code is changed. Will be shifted. Then, the receiver 2 determines that the password in the received transmission code does not match the reference code (step S14). In this case, as a process on the receiver 2 side, the received security code is temporarily stored, and at the same time, the timer is started from the time when the security code is determined as an error (step S15). If a mismatched security code is received again while the timer is running, the timer is restarted.

On the other hand, paying attention to the operation of the transmitter 1, if the key does not respond even if the operation switch 5 is remotely operated several times, the user tries to open the door with a regular key as human psychology. It is expected that. When the user operates the key cylinder of the door with a proper key, the lock state of the door of the automobile changes, and the door lock detection switch 20 detects the door lock detection signal.

Therefore, as a process on the receiver 2 side, when the timer started when the password is determined to be an error is still running (steps S19 and S20).
When the locked state of the door changes, that is, when the door is locked or unlocked within a predetermined time, in step S22, the temporarily stored password is re-registered as the reference code, and the timer is stopped. This is performed by updating the security code temporarily stored in the RAM of the receiver 2 and rewriting the reference code stored in the EEPROM 13 of the receiver 2 to the same value as the updated security code. . Thereby, the deviation between the personal identification code and the reference code is corrected, and the identity between the two is maintained. In step S20, if the timer has timed out and the locked state of the door has not changed within the predetermined time, the timer is stopped (step S23), and the transmission code reception standby state is resumed.

As described above, in the keyless entry system according to the first embodiment, when a difference occurs between the password of the transmission code and the reference code of the receiver,
When the user locks or unlocks the door using a proper key, the error code is re-registered as the reference code, so that accidental opening and closing of the door by the user having the same ID code can be prevented. Security can be improved.

[Second Embodiment] Next, the operation of the receiver 2 according to a second embodiment of the present invention will be described. FIG.
As shown in the figure, in the second embodiment, the normal operation (step S31 to step S38) in which the personal identification code and the reference code match is the same as the normal operation (step S11 to step S18) in the first embodiment. Therefore, the description is omitted here. Hereinafter, the operation in the case where a difference occurs between the personal identification code and the reference code will be described in detail.

When there is a shift between the personal identification code and the reference code due to the idle pressing of the operation switch 5 on the transmitter 1 side, the personal identification code in the received transmission code is replaced by the receiver 2 with the reference code. It is determined that they do not match (step S34). Then, in this case, the received personal identification code is temporarily stored and held as a process of the receiver 2 (step S35).

On the other hand, paying attention to the operation of the transmitter 1, if the user is a regular user, he inserts a regular key into an ignition key cylinder (not shown), operates the engine to an ON position, starts the engine, and operates the engine. It is expected to be. When the user operates the ignition key cylinder to the ON position with a proper key (step S39), the state of the ignition switch changes, and an IG key detection signal is output by the IG key detection switch 19 connected to the input terminal of the receiver 2. Is detected.

In this case, as a process on the receiving side, if an error occurs and there is a personal identification code stored in the RAM 13 of the memory means (step S44), the personal identification code is regarded as a coincident personal identification code and is re-determined as a reference code. Register (step S45).

Looking again at the operation of the transmitter 1, there may be cases where the user accidentally operates the operation switch during driving or within a predetermined time after getting off the vehicle. In this case, the keyless entry system of the present embodiment re-registers the reference code in accordance with the change of the ignition switch from the ON state to the OFF state at the time of getting off.

When the user finishes driving and gets off the vehicle, the user inserts a proper key into the ignition key cylinder and operates the IG from on to off (step S).
40). When the state of the ignition switch changes, the IG key
A key detection signal is detected.

Therefore, as a process on the side of the receiver 2, a timer is started at the same time when the state of the ignition switch changes (step S41). Then, if there is a temporarily stored error password code within a predetermined period of time while the timer is running (steps S42 and S43) (step S44), the password is re-registered as a reference code and the timer is stopped. (Step S45). this is,
This is performed by updating the security code temporarily stored in the RAM 14 of the receiver 2 and rewriting the reference code stored in the EEPROM 13 of the receiver 2 to the same value as the updated security code. Thereby, the deviation between the personal identification code and the reference code is corrected, and the identity between the two is maintained.

In step S43, if the activated timer times out and there is no error code within a predetermined time, the timer is stopped (step S2).
3) The transmission code reception standby state is resumed.

As described above, in the keyless entry system according to the second embodiment, when a deviation occurs between the password of the transmission code and the reference code of the receiver,
When the user operates the ignition switch using a proper key at the time of getting on and off the vehicle, the password having the error is re-registered as the reference code, so that the accidental door by the user having the same ID code is used. Can be prevented from opening and closing, and security can be improved.

As described above, in the keyless entry system according to the present embodiment, even if a shift occurs between the personal identification code and the reference code due to the idling of the operation switch 5 or the like, the transmitter 1 (namely, the user's regular code). Key) corresponds to the receiver 2, the lock mechanism 3 operates properly. In other words, in order to re-register the erroneous password as the reference code, it is necessary to operate a regular key owned by the user, and it is possible to prevent a user having the same ID code from accidentally opening and closing the door.

In implementing the present invention, a keyless entry system for instructing starting or stopping of an automobile engine, turning on or off a headlight, or the like may be provided.

[0052]

As described above, according to the keyless entry system of the present invention, by referring to the key unique to the user, accidental opening and closing of the door by the user having the same ID code can be prevented, and security can be improved. Can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an entire keyless entry system according to an embodiment.

FIG. 2 is an explanatory diagram showing a format of a transmission code in the embodiment.

FIG. 3 is a flowchart showing an operation procedure on the transmitter side in the embodiment.

FIG. 4 is a flowchart showing an operation procedure on the receiver side according to the first embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation procedure on the receiver side according to the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitter 2 Receiver 3 Lock mechanism part 4 Battery 5 Operation switch 6, 11 CPU 7, 12 ROM 8, 13 EEPROM 9, 14 RAM 10 Transmitting circuit 15 Receiving circuit 16 Interface 17 Battery 18 Actuator

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E250 AA21 BB08 BB66 DD06 EE08 FF24 FF35 GG08 GG13 HH01 JJ03 KK03 LL01 SS04 SS08 SS11 TT03 5B072 BB09 CC39 5K048 AA15 BA42 BA53 DB01 DC01 EA16 EB02 HA04 HA06

Claims (4)

[Claims] 1. A transmitter for transmitting and outputting a transmission code relating to a predetermined operation instruction including a personal identification code each time an operation switch is operated, and receiving the transmission code and setting the personal identification code of the transmission code to a reference code. Has a receiver that outputs an operation signal corresponding to the transmission code, on condition that the transmission code matches the password, the transmitter updates the password every time the operation switch is operated, and the receiver includes: In a keyless entry system that updates a reference code each time the transmission code is received in response to the password, the receiver includes a predetermined operation member on a receiver side when the password and the reference code do not match. A keyless electronic device comprising: control means for re-registering a password as a reference code by regarding the password as a matched password when the state changes. Tree system. 2. The control means according to claim 1, wherein when the state of said predetermined operation member changes within a predetermined time, said control code is regarded as a matching password and registered again as a reference code. The keyless entry system according to claim 1. 3. The keyless entry system according to claim 1, wherein the control unit includes a detection unit that detects a change in the state of the predetermined operation member based on a use of a regular key by the user. . 4. The predetermined operation member is a vehicle door lock or an ignition switch, and the state change of the predetermined operation member is a state in which the door is changed from a locked state to an unlocked state or from an unlocked state. The ignition switch is operated from the off state to the on state or from the on state to the off state.
3. The keyless entry system according to claim 1.