JP3112921B2 - Keyless entry system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field to which the Invention Belongs) The present invention is directed to receiving a code signal transmitted by operating an entry switch provided in a portable transmitter by a receiving means of a keyless entry device provided in a vehicle. And a keyless entry system that performs door unlocking.

(Prior Art) Conventionally, as a keyless entry system of the above example,
For example, there is one described in JP-A-63-31847.

That is, the light emitting element emits an optical code signal by operating a door lock / unlock entry switch provided on a portable transmitter (remote control key), and this optical code signal is transmitted to the light receiving element of the vehicle side keyless entry device. The keyless entry system is configured to receive light and execute door lock or door unlock when a key code (identification code) matches.

According to this conventional device, there is an advantage that the door lock and the unlock can be remotely controlled, but on the other hand, since the above-mentioned key codes are all fixed codes, if the key code is decrypted by any means, However, there is a problem that the vehicle may be stolen.

(Problem to be Solved by the Invention) In the invention according to claim 1 of the present invention, a keyless entry device receives a code signal composed of an ID code and a variable code from a portable transmitter side, and the code signal matches. When the code signal of the portable transmitter is updated and mismatched due to radio interference or unnecessary operation, the variable code of the received code signal is If the variable code is a variable code that is to be changed within the first number of times from the currently stored variable code, the door is configured to be unlocked. The door can be unlocked even if the codes are not aligned, and it is necessary to take measures to match the code signal and to prevent the code signal from shifting. There is no,
It can be used without any discomfort for the user who performs normal operations, and the convenience can be improved.
Further, when the code signal is stolen by another person, only the ones that match within the first number of times are set as the unlock condition, so that the inconvenience of accidental matching with an appropriate signal can be avoided, and a signal other than the genuine portable transmitter can be used. Not unlocked at the signal
Providing a keyless entry system that can ensure a sufficiently high degree of theft resistance and also transmits an ID code as a code signal, thereby improving reliability against theft and improving convenience at a high level With the goal.

According to a second aspect of the present invention, in addition to the object of the first aspect, the variable code of the code signal transmitted from the portable transmitter is larger than the first predetermined number of times in the keyless entry device. If the variable code that is to be changed within the second predetermined number of times matches, the door unlocking is permitted under the condition that the successive variable code to be changed next time also matches, and the door unlocking is disallowed when they do not match. The object of the present invention is to provide a keyless entry device that is supposed to match continuously when the number of permissible times increases, has a very low probability of matching twice when radio waves are stolen, and can secure a high degree of reliability. And

According to a third aspect of the present invention, in addition to the object of the first or second aspect, the variable code is increased and changed only in a predetermined direction. When it is determined that the variable code of the code signal transmitted from the keyless entry device is in a decreasing direction opposite to the predetermined direction with respect to the variable code of the code signal currently stored in the keyless entry device, the door is unlocked. By prohibiting the process and not unlocking the door, the signal becomes a state that is more negative than the stored value at the time of radio wave theft, the unlock control by this theft signal is prohibited, and the variable code is accidentally Since there is no matching situation, and the judgment can be executed only by looking at the relationship with the currently stored value, the judgment process can be performed quickly and the reliability against theft is extremely high. Door to the object of the present invention to provide a keyless entry system that can.

(Means for Solving the Problems) According to a first aspect of the present invention, a code signal transmitted by operating an entry switch provided in a portable transmitter is received by a receiving means of a keyless entry device provided in a vehicle. A keyless entry system for performing door unlocking when a code signal received from said portable transmitter matches a code signal stored in said keyless entry device, said portable transmitter comprising: The code signal transmitted from and the code signal stored in the keyless entry device are composed of an ID code as a recognition code for positioning the correspondence between the portable transmitter and the keyless entry device, and a variable code. The portable transmitter and the keyless entry device are capable of changing a variable code of a code signal transmitted from the portable transmitter. And a variable code updating means for changing and updating the variable code of the code signal stored in the keyless entry device so as to be the same variable code based on a predetermined rule. Even if the variable code of the code signal transmitted from the portable device does not match the variable code of the code signal stored in the keyless entry device, the variable code of the code signal transmitted from the portable transmitter is If the variable code of the code signal stored in the keyless entry device matches the variable code that is to be changed within the first number of times, the door unlock is permitted, and if not, the door unlock is not permitted. The keyless entry system is configured to perform

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the variable code of the code signal transmitted from the portable transmitter is controlled by the keyless entry device to a first predetermined number of times. If the variable code that is to be changed within the second predetermined number of times also matches, the door unlock is permitted under the condition that the variable code that is scheduled to be changed next time also matches, and if it does not match, the door unlock is performed. The keyless entry system is configured to be rejected.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the variable code is configured to be increased and changed only in a predetermined direction, and the keyless entry device is provided. Determines that the variable code of the code signal transmitted from the portable transmitter is in a decreasing direction opposite to the predetermined direction with respect to the variable code of the code signal currently stored in the keyless entry device. Prohibits the door unlocking process when
The keyless entry system prevents door unlocking.

According to the first aspect of the present invention, a code signal (including an ID code and a variable code) transmitted by operating an entry switch provided in a portable transmitter is transmitted to a vehicle. The received code is received by the receiving means of the provided keyless entry device and the door is unlocked, but the variable code updating means described above uses the same code as the portable transmitter and the variable code of the code signal of the keyless entry device based on a predetermined rule. Change and update each so that it becomes a variable code.

The keyless entry device enables the door to be unlocked when the code signal transmitted from the portable transmitter matches the variable code of the code signal stored in the keyless entry device. Indicates that the variable code of the code signal transmitted from the portable transmitter is keyless even if the variable code of the code signal transmitted from the portable transmitter does not match the variable code stored in the keyless entry device. If the variable code of the code signal stored in the entry device matches the variable code that is to be changed within the first number of times, the door unlock is permitted, and if not, the door unlock is not permitted. And

As described above, the keyless entry device receives the code signal including the ID code and the variable code from the portable transmitter side, and executes the door unlock when the variable code matches. Even if the code signal on the portable transmitter side is updated and mismatched, the variable code of the received code signal is changed within a first number of times from the variable code currently stored in the keyless entry device. If it is a code, the door is configured to be unlocked, so even if the variable code does not match due to radio wave interference and the unlocking conditions are not met, the door can be unlocked and the code signal matches There is no need to take hardware measures to prevent work or code signal deviation, and it is used without any discomfort for users who perform normal operations And be Rukoto, there is an effect that it is possible to improve the convenience.

In addition, when the code signal is stolen by another person, only those that match within the first number of times are used as the unlock condition, so that an inconvenient inconsistency can be avoided with an appropriate signal. Signals are not unlocked, and a sufficiently high degree of theft resistance can be ensured. In addition, the portable transmitter also transmits ID codes as code signals, improving reliability and convenience for theft, etc. There is an effect that improvement can be achieved at a high level.

According to the invention of claim 2 of the present invention, in addition to the effect of the invention of claim 1, the variable code of the code signal transmitted from the portable transmitter is transmitted from the keyless entry device to the first predetermined number of times. If the variable code to be changed within the second predetermined number of times matches the variable code to be changed within the second predetermined number of times, the door unlocking is permitted under the condition that the variable code to be changed next time also matches. By doing so, it is a condition that, when the allowable number of times increases, it is required that they match continuously. Therefore, when the radio wave is stolen, the probability of matching twice consecutively is extremely low, and there is an effect that high reliability can be secured. .

According to the third aspect of the present invention, in addition to the effect of the first or second aspect, the variable code is configured to be increased and changed only in a predetermined direction. When it is determined that the variable code of the code signal transmitted from the transmitter is in a decreasing direction opposite to the above-described predetermined direction with respect to the variable code of the code signal currently stored in the keyless entry device, Since the unlocking process is prohibited and the door is not unlocked, the signal is more negative than the stored value at the time of radio wave theft, the unlock control by this theft signal is prohibited, and the variable code is Since there is no chance of coincidence, and the judgment can be executed only by looking at the relationship with the currently stored value, the judgment process can be performed quickly and the reliability against theft is extremely high. There is an effect that can Rukoto.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

The drawing shows a keyless entry system. In FIG. 1, a portable transceiver 71 as a portable transmitter includes an entry switch 72 for door lock and unlock, and a CP.
U70, a transmission / reception circuit 73, a code change unit 74, and a transmission / reception antenna 75, and the CPU 70 drives the transmission / reception circuit 73 and the code change unit 74 according to a program stored in the ROM 76 based on the ON signal input of the entry switch 72. Control and also RA
M77 is a variable code d (see FIG. 2) of the code signal F2 changed by the code changing unit 74, and an equation as a predetermined rule for changing the variable code d for each single transmission / reception cycle of the communication means 90 described later, for example, An Required data such as a map corresponding to = An-1 × 3 + 1 is stored.

On the other hand, the keyless entry device 78 provided on the vehicle side functions as a transceiver having a total reception function, and the keyless entry device 78 includes a transmission / reception antenna 79, a transmission / reception circuit 81, a code identification unit 82, and a code change unit 83. I have.

The CPU 80 reads the ROM based on the input from the code identification unit 82.
According to the program stored in 84, the code changing unit 83, the door lock driver 85, the door lock and unlock actuator 86 are driven and controlled, and the RAM 87 stores the variable code of the code signal F2 changed by the code changing unit 83. d
(See FIG. 2), necessary data such as an equation as a predetermined rule for changing the variable code d for each single transmission / reception cycle of the communication means 90 described later, such as a map corresponding to An = An-1 × 3 + 1, is stored. .

Here, the communication means 90 is determined by the above-described elements 73, 75, 79, 81.
Is composed.

The actuator 86 is a variable motor for locking or unlocking a door via a door lock mechanism.

Further, the keyless entry device 78 has a manual operation switch 88. In addition to the code signal F2 from the portable transceiver 71 (see FIG. 2), when the manual operation switch 88 is turned on, the door lock and the door can be locked. It is configured to execute lock release.

FIG. 2 shows the frame of the code signal F2,
F2 is an ID as a unique recognition code for positioning the correspondence between the portable transceiver 71 and the keyless entry device 78
It has a code a, an operation code b for designating door lock or door lock release (unlock), and a variable code d.

In this embodiment, the variable code d is changed based on the equation An = An-1 × 3 + 1 every single transmission / reception period by the communication means 90 described above.

The following table shows a map of the number n of communication cycles to be stored in each of the RAMs 77 and 87 and the value of the variable code d.

The operation of the keyless entry system configured as described above will be described with reference to the flowchart of FIG. 3, taking door lock release (unlocking) as an example.

When the entry switch 72 of the portable transceiver 71 is turned on, the CPU 70 sets the communication means based on the rules set in the RAM 77.
A code signal F2 is exchanged with the keyless entry device 78 on the vehicle side via 90.

In the first step 91, the CPU 8 on the keyless entry device 78 side
0 is a transmission / reception antenna 79, a transmission / reception circuit 81, a code identification unit 82
The presence / absence of a door unlock signal is determined based on the input from the controller.
Move to

In this second step 92, the CPU 80
It is determined whether or not the value of the variable code d (see FIG. 2) matches the preset rule, that is, the value of the equation An = An-1 × 3 + 1. On the other hand, when the match is made (when YES is determined), the process skips to the seventh step 97, and in the seventh step 97, the CP
U80 actuator 86 via door lock driver 85
Is driven in the unlock direction to perform door unlocking.

In the above-described third step 93, the CPU 80 compares the current received value An with the previous received value An-1.

For example, when the communication cycle number n is the third time, the original received value (the value of the variable code d) is “7”, and the previous reception value (the communication cycle number n)
Is the second time) (the value of the variable code d) is “4”, and if a value corresponding to, for example, “2” is received from another transmitter owned by the occupant other than the occupant, 2 < 4, the process (door unlocking process) is prohibited, and the value received this time
The process shifts to the next fourth step 94 only when An is larger than the previous received value An-1 (when NO is determined).

In the fourth step 94, the CPU 80 determines whether or not the current reception value An matches the change value within five times from the previous reception value An-1. In other words, for the purpose of avoiding inoperability based on the unreachability of the code signal F2 due to radio interference, for example, when the current reception value (the value of the variable code d) is “10”, the previous reception value (the value of the variable code d) “ It is determined whether or not any one of the change values “7”, “10”, “13”, “16”, and “19” within five times from “7” is matched. While skipping to step 97 to execute the door lock release, the process proceeds to the next fifth step 95 when they do not match (when NO is determined).

In the fifth step 95, the CPU 80 determines that the current received value (the value of the variable code d) is 50 times the previous received value (the value of the variable code d).
It is determined whether or not it matches the change value within the number of times. That is, for the purpose of avoiding the inability to operate based on the unreachability of the code signal F2 due to the radio interference, for example, when the current reception value An is “148” corresponding to the communication cycle number 50, the previous reception value “1” is 50
Change values within times "1""4""7""10""13" ... "14
5 ”and“ 148 ”are determined, and when YES is determined, the flow shifts to the next sixth step 96.

In the sixth step 96, the CPU 80 determines that the next received value (the value of the variable code d) is the change value “15” within the 51st communication cycle.
"1" is determined, and the process proceeds to the next seventh step 97 only when the values match (when YES is determined).

In the seventh step 97, the CPU 80 sets the door lock driver 8
The actuator 86 is driven in the unlocking direction via 5 to unlock the door.

As described above, according to the above embodiment and the keyless entry system, the code signal F2 transmitted by operating the entry switch 72 provided in the portable transmitter (see the portable transceiver 71).
(Including the ID code a and the variable code d) are received by the keyless entry device 78 provided in the vehicle (the transmitting / receiving antenna 79
), And the door is unlocked. The variable code updating means (see the code changing units 74 and 83) described above uses the variable code d of the portable transmitter 71 and the keyless entry device 78.
Is changed and updated based on a predetermined rule (see equation An = An-1 × 3 + 1) so that the same variable code is obtained.

The keyless entry device 78 enables the door to be unlocked when the code signal F2 transmitted from the portable transmitter 71 matches the code signal F2 stored in the RAM 87. The variable code d of the code signal F2 transmitted from the transmitter 71 is stored in the RAM 87.
Even if the variable code d of the code signal F2 transmitted from the portable transmitter 71 does not match the variable code d of the code signal F2 stored in the
A variable code d to be changed within a first number (five times in this embodiment) from the variable code d stored in M87.
(See the YES determination of the fourth step 94)
While the door unlocking is permitted, if they do not match (see NO determination in the fourth step 94), the door unlocking is not permitted.

As described above, the keyless entry device 78 receives the code signal F2 including the ID code a and the variable code d from the portable transmitter 71, and executes the door unlock when the variable code d matches. Even if the code signal on the portable transmitter 71 side is updated and mismatched due to a failure or unnecessary operation, the value of the variable code d of the received code signal F2 is currently stored in the RAM 87 in the keyless entry device 78. If the value of the variable code d is to be changed within a first number of times (for example, five times) from the variable code d of the code signal, the door is unlocked. The door can be unlocked even if the unlocking conditions are not met, and it is necessary to take measures to match the code signal and take measures to prevent the code signal from shifting. It is unnecessary and can be used without any uncomfortable feeling for a user who performs a normal operation, thereby improving the convenience.

Further, when the code signal F2 is stolen by another person, only those that match within the first number of times are set as the unlock condition, so that the inconvenience of accidentally matching with an appropriate signal can be avoided,
Signals from sources other than the real portable transmitter 71 are not unlocked, ensuring a sufficiently high degree of theft resistance. In addition, by transmitting the ID code a as the code signal F2, reliability against theft etc. There is an effect that the improvement of the performance and the improvement of the convenience can be compatible at a high level.

Further, the code signal F2 transmitted from the portable transmitter 71
Of the variable code d coincides with the variable code d to be changed by the keyless entry device 78 within a second predetermined number (for example, 50 times in the fifth step 95) which is larger than the first predetermined number (for example, 5 times). In this case, the door unlock is permitted under the condition that the variable code to be changed next time (see the 51st change value in the sixth step 96) also matches (the sixth step).
96 (see YES determination), and when they do not match (NO in the sixth step 97)
(See Judgment at the time of judgment), door unlocking is not permitted, and when the number of permitted times increases (increased from 5 times to 50 times in this embodiment), it is a condition that they match continuously. In the case of theft, the probability of two consecutive matches is extremely low, and there is an effect that high reliability can be secured.

Moreover, the keyless entry device 78 is configured to increase and change the variable code d only in a predetermined direction (see the above table).
The variable code d of the code signal F2 transmitted from the portable transmitter 71 is different from the predetermined direction described above with respect to the variable code d of the code signal F2 currently stored in the RAM 87 of the Keith entry device 78. When it is determined that the direction is the opposite decreasing direction (refer to YES determination in the third step 93), the door unlocking process is prohibited and the door is not unlocked. It becomes a signal in a more negative state, the unlock control by this theft signal is prohibited, and the situation where the variable code d coincides by chance can be eliminated, and furthermore, the judgment is made only by looking at the relationship with the current storage value of the RAM 87 Since it is possible to perform the determination process quickly, there is an effect that the cost for theft can be extremely high.

In the correspondence between the configuration of the present invention and the above-described embodiment, the receiving means of the present invention corresponds to the transmitting / receiving antenna 79 of the embodiment. Similarly, the code signal is converted to the code signal F2 (see FIG. 2). Corresponding, the predetermined rule corresponds to the equation An = An−1 × 3 + 1, the first number corresponds to five times, and the first predetermined number corresponds to five times (see fourth step 94). The second predetermined number of times corresponds to 50 times (refer to the fifth step 95). The next consecutive time corresponds to 51 times (refer to the sixth step 96). The portable transmitter corresponds to the portable transmitter / receiver 71, and the variable code updating means corresponds to the code changing units 74 and 83. It is not limited only to the configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a keyless entry system, FIG. 2 is an explanatory diagram showing a frame of a code signal, and FIG. 3 is a flowchart showing a door lock release process. 71 Portable transmitter / receiver (portable transmitter) 72 Entry switch 74,83 Code change section (variable code updating means) 78 Keyless entry device 79 Transmitter / receiver antenna (receiving means) F2 Code signal a: ID code b: Variable code

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-104878 (JP, A) JP-A-1-278671 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E05B 49/00 E05B 65/20

Claims (3)

(57) [Claims] A code signal transmitted by operating an entry switch provided on a portable transmitter is received by a receiving means of a keyless entry device provided on a vehicle, and a code signal transmitted from the portable transmitter is received. Is a keyless entry system that performs door unlocking when the code signal matches the code signal stored in the keyless entry device, wherein the code signal transmitted from the portable transmitter and the keyless entry device are stored in the keyless entry device. The code signal
The portable transmitter and the keyless entry device are composed of an ID code as a recognition code for locating the correspondence between the keyless entry device and the variable code, and the portable transmitter and the keyless entry device are transmitted from the portable transmitter. Variable code updating means for changing and updating the variable code of the code signal to be generated and the variable code of the code signal stored in the keyless entry device so as to be the same variable code based on a predetermined rule. The code signal transmitted from the portable transmitter, even if the variable code of the code signal transmitted from the portable transmitter does not match the variable code of the code signal stored in the keyless entry device. Is the first code from the variable code of the code signal stored in the keyless entry device. A keyless entry system configured to permit door unlocking when it matches the variable code to be changed within the number of times, but disallow door unlocking when it does not match. 2. The variable code of a code signal transmitted from the portable transmitter matches a variable code to be changed within a second predetermined number greater than a first predetermined number in the keyless entry device. The keyless entry system according to claim 1, wherein the door unlock is permitted under a condition that the variable codes scheduled to be changed next time also match, and the door unlock is not permitted when the variable codes do not match. 3. The keyless entry device according to claim 1, wherein the variable code is configured to be increased and changed only in a predetermined direction, and the variable code of the code signal transmitted from the portable transmitter is changed to the keyless entry. When it is determined that the variable code of the code signal currently stored in the apparatus is in the decreasing direction opposite to the predetermined direction, the door unlocking process is prohibited, and the door unlocking is not performed. The keyless entry system according to claim 1 or 2.