JP4071450B2 - Rolling code generation method and vehicle control apparatus using rolling code - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for generating a rolling code used for encryption such as a keyless entry of a vehicle, and a vehicle control device using the rolling code.
[0002]
[Prior art]
For example, when locking and unlocking a vehicle door, it is troublesome to insert a key into the key cylinder and rotate it each time, making it easier to lock and unlock the vehicle door. The system is in practical use.
[0003]
In the keyless entry system, an ID code is transmitted from the key carried by the driver, this ID code is received on the vehicle side, and it is confirmed that the received ID code matches the ID of the vehicle. The vehicle door is locked or unlocked by electric operation. At this time, since the ID code is transmitted by radio signal from the key side to the vehicle side, the ID code may be monitored by another person. When monitored, the vehicle door is easily unlocked. End up.
[0004]
Therefore, in order to solve such a problem, various types have been conventionally proposed in which a rolling code is used so that the ID code is not known to others.
[0005]
FIG. 10 is a block diagram showing a configuration of a first conventional example of a keyless entry system using a rolling code. As shown in FIG. 10, this keyless entry system 101 includes a remote unit 102 carried by a driver. And an in-vehicle unit 103 which is mounted on the vehicle 112 and performs code communication with the remote unit 102.
[0006]
The remote unit 102 includes an ID code memory 104 in which an ID code is stored, a transmission counter 105, a code generation unit 106 that generates a rolling code based on the ID code and the count value of the transmission counter, and a transmission unit 107. It has. The in-vehicle unit 103 includes a receiving unit 108 that receives the rolling code transmitted from the remote unit 102, a code decoding unit 109 that decodes the received rolling code, a transmission counter 110, and an ID code memory 111. It has.
[0007]
When the driver presses an operation switch (not shown) on the remote unit 102, the rolling code is transmitted to the in-vehicle unit 103 as transmission data. The in-vehicle unit 103 decrypts the rolling code transmitted from the remote unit 102 and confirms that the ID code read as a result of the decryption matches the ID code stored in the ID code memory 111 of the in-vehicle unit 103. In this case, the door of the vehicle 112 is locked or unlocked. Also, since the rolling code is changed every time it is transmitted, confidentiality is ensured.
[0008]
However, in such a conventional method for generating a rolling code used in a keyless entry system, the risk that the door can be opened by another person can be extremely reduced by adopting a method in which the rolling code is switched each time. Although possible, if the operation switch of the remote unit 102 is pressed regardless of the code transmission, the rolling code may not be verified.
[0009]
That is, when the vehicle is not driven, the driver usually carries the remote unit 102, and when the operation switch of the remote unit 102 is pushed meaninglessly, the transmission counter 105 of the remote unit 102 is incremented and the rolling code is Updated. On the other hand, since the count value in the transmission counter 110 of the in-vehicle unit 103 is not updated, when the rolling code is transmitted from the remote unit 102 to the in-vehicle unit 103 in this state, the in-vehicle unit 103 decodes the rolling code. The ID code obtained in this way does not match the ID code set in advance, and a trouble that the door unlocking operation cannot be performed occurs.
[0010]
If the number of times that the operation switch is pressed is meaningless is small, it can be handled by software processing, and the rolling code can be verified. However, if the number of times that the operation switch is pressed is large, ID code verification can be performed. In such a case, the rolling code must be set again, and the operation is troublesome.
[0011]
As a second conventional example, a keyless entry system 121 that generates a rolling code by using a clock circuit is known as shown in FIG. That is, in this keyless entry system 121, the in-vehicle unit 123 is provided with an initial value memory 125 in which a plurality of addresses and initial values corresponding to the addresses are recorded, and a clock circuit 124 is further provided. Then, the address of the initial value memory 125 is determined based on the time data obtained from the clock circuit 124, the initial value data is taken out, and a rolling code is generated based on the initial value data, so that a more confidential code Communication is possible.
[0012]
However, in the keyless entry system 121 having such a configuration as well, as in the case of the keyless entry system 101 shown in FIG. There arises a problem that collation cannot be performed.
[0013]
Further, as a third conventional example, Japanese Patent Laid-Open No. Hei 9-17797 prepares an initial value card in which an initial value and an auxiliary code are recorded in advance, and scrambles using the initial value and the auxiliary code. Describes how to generate a rolling code that is extremely difficult to decipher, lock the door and unlock the door after confirming that the rolling code matches between the remote unit and the in-vehicle unit. ing.
[0014]
However, even in such a configuration, as in the first and second conventional examples, the ID code cannot be verified when the operation switch is meaninglessly pressed on the remote unit. The problem occurs.
[0015]
[Problems to be solved by the invention]
As described above, in the conventional method for generating a rolling code, when the operation switch of the remote unit is pressed meaninglessly (when pressed regardless of the code transmission), the rolling code transmitted from the remote unit is transmitted. There has been a problem that the code and the rolling code for collation with the in-vehicle unit may not match, which makes remote control impossible.
[0016]
The present invention has been made to solve such a conventional problem, and the object of the present invention is to reliably perform code communication even when a meaningless operation of an operation switch of a remote unit is performed. An object of the present invention is to provide a rolling code generation method that can be performed and a vehicle control device using the rolling code.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present application is a method for generating a rolling code that is transmitted from a remote unit to an in-vehicle unit mounted on a vehicle and used to determine whether or not the in-vehicle device can be operated. Because When the engine is stopped, the vehicle mileage data is transmitted to the remote unit, and the remote unit stores the mileage data, The remote unit generates a rolling code that becomes different data each time it is used, based on a basic code unique to a vehicle and the travel distance data.
[0018]
The invention according to claim 2 is a method for generating a rolling code to be used when transmitting from a remote unit to an in-vehicle unit mounted on a vehicle and determining whether the operation of the in-vehicle device can be performed. When the engine is stopped, the travel distance data of the vehicle is transmitted to the remote unit, and the remote unit stores a plurality of travel distance data obtained in time series, A first basic code unique to the vehicle and a second basic code; Of the plurality of mileage data Based on the first mileage data and the second mileage data, a rolling code that is different for each use is generated.
[0019]
The invention according to claim 3 is based on a combination of at least one of the first basic code and the second basic code and at least one of the first travel distance data and the second travel distance data. Generating a first rolling code for use in permitting opening and closing of the door of the vehicle, and at least one of the first basic code and the second basic code; the first mileage data; and the second Generating a second rolling code used when permitting engine start of the vehicle based on a combination different from the combination used at the time of generating the first rolling code out of a combination with at least one of mileage data It is characterized by doing.
[0020]
According to a fourth aspect of the present invention, the first travel distance data and the second travel distance data used when boarding the vehicle this time are the travel distance data at the time of the previous engine stop and the previous engine stop, respectively. It is the mileage data at the time.
[0021]
The invention according to claim 5 performs data transmission between the remote unit and the in-vehicle unit mounted on the vehicle, confirms that the rolling code sent from the remote unit to the in-vehicle unit is appropriate, In the vehicle control device that permits the operation of the device and prevents the vehicle from being stolen, The in-vehicle unit has transmission means (16) for transmitting mileage data of the vehicle to the remote unit when the engine is stopped. Based on vehicle-specific basic code and mileage data of the vehicle The rolling code Generate Code generation means (8) It is characterized by comprising.
[0022]
The invention according to claim 6 performs data transmission between the remote unit and the in-vehicle unit mounted on the vehicle, confirms that the rolling code sent from the remote unit to the in-vehicle unit is appropriate, In the vehicle control device that permits the operation of the device and prevents the vehicle from being stolen, The in-vehicle unit has transmission means (16) for transmitting the travel distance data of the vehicle to the remote unit when the engine is stopped, and the remote unit transmits the travel transmitted from the in-vehicle unit. Receiving means (6) for receiving distance data; At least one of the first basic code and the second basic code unique to the vehicle; Received by the receiving means Generating a first rolling code based on a combination of at least one of the first mileage data and the second mileage data, and at least one of the first basic code and the second basic code; A second rolling code is generated based on a combination different from the combination used when generating the first rolling code among the combinations of at least one of the first mileage data and the second mileage data. Code generating means (8), and the in-vehicle unit further includes: Using the first rolling code and the second rolling code, the permission determination of the operation of the in-vehicle device is performed. Code decoding means (17) It is characterized by comprising.
[0023]
The invention according to claim 7 performs data transmission between the remote unit and the vehicle-mounted unit mounted on the vehicle, confirms that the rolling code sent from the remote unit to the vehicle-mounted unit is appropriate, In the vehicle control device that permits the operation of the device and prevents the vehicle from being stolen, The in-vehicle unit has transmission means (16) for transmitting the mileage data of the vehicle to the remote unit when the engine is stopped. The remote unit includes remote storage means for storing first mileage data and second mileage data transmitted from the in-vehicle unit, a first basic code unique to the vehicle, and the first mileage. A first rolling code is generated based on at least one of the distance data and the second travel distance data, and the second basic code unique to the vehicle, the first travel distance data, and the second travel Rolling code generating means for generating a second rolling code based on at least one of the distance data, and the in-vehicle unit includes: More Based on the vehicle-side storage means for storing the first travel distance data and the second travel distance data of the vehicle, the first rolling code transmitted from the remote unit, and the first basic code , Decoding at least one of the first mileage data and the second mileage data, and based on the second rolling code transmitted from the remote unit and the second basic code, Rolling code decoding means for decoding at least one of mileage data and second mileage data, the first mileage data decoded by the rolling code decoding means, and the second mileage data are Collation means for collating whether or not the first mileage data and the second mileage data stored in the storage means match, and the first roll When the collation of at least one of the first mileage data and the second mileage data obtained by decoding the code is confirmed, the vehicle door is locked and unlocked, and the second rolling code is And a means for permitting the start of the engine of the vehicle when verification of at least one of the first travel distance data and the second travel distance data obtained by decoding is confirmed.
[0024]
In the invention according to claim 8, the first travel distance data and the second travel distance data used when boarding the vehicle this time are the travel distance data at the time of the previous engine stop and the previous engine stop, respectively. It is the mileage data at the time.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a vehicle control apparatus according to an embodiment of the present invention. As shown in the figure, the vehicle control device 1 includes a remote unit 2 that can be carried by a driver, and an in-vehicle unit 3 that is mounted on a vehicle 4 and that can perform code communication with the remote unit 2. It has.
[0026]
The remote unit 2 includes an ID code memory 5 in which a basic code unique to the vehicle 4 is stored, a receiving unit 6 that receives travel distance data transmitted from the in-vehicle unit 3, and a travel that stores received travel distance data. Based on the distance memory 7, based on the basic code and mileage data, a code generation unit 8 that generates a rolling code in a procedure to be described later, and a transmission unit 9 that transmits the generated rolling code to the in-vehicle unit 3 is doing.
[0027]
The in-vehicle unit 3 inputs output signals of a receiving unit 10 that receives a rolling code transmitted from the remote unit 2, a microcomputer 11, and a mileage meter (meter that indicates a cumulative mileage) 12 mounted on the vehicle 4. An interface 15 that inputs the ignition signal given from the starter relay 14 in conjunction with the interface 13 and the starter relay 14 of the vehicle 4, and a transmission unit that sends the travel distance data given from the travel distance meter 12 to the remote unit 2. 16.
[0028]
The microcomputer 11 includes a code decoding unit 17 that decodes the received rolling code, an ID code memory 18 that stores a basic code unique to the vehicle 4, and a travel distance that stores travel distance data provided by the travel distance meter 12. A memory 19 and a code verification unit 20 that performs code verification are included.
[0029]
Two basic codes (a first basic code and a second basic code) are stored in the ID code memory 5 of the remote unit 2 and the ID code memory 18 of the in-vehicle unit 3, respectively.
[0030]
FIG. 2 is a flowchart showing a flow of a process for fetching mileage data used for generating a rolling code into the in-vehicle unit 3, FIG. 3 is a flowchart showing a flow of a process for taking the mileage data into the remote unit 2, FIG. 5 is a flowchart showing a processing procedure in the in-vehicle unit 3 when locking and unlocking the door lock, and FIG. 6 is a flowchart showing the processing procedure in the in-vehicle unit 3 when locking and unlocking the door lock. FIG. 7 is a flowchart showing a processing procedure in the in-vehicle unit 3 when starting the engine. FIG. 7 is a flowchart showing a processing procedure in the remote unit 2 when starting the engine. The operation of will be described.
[0031]
First, when the engine of the vehicle 4 is stopped (YES in step ST1 in FIG. 2), the travel distance data output from the travel distance meter 12 is read by the microcomputer 11 via the interface 13 (step ST2). . Then, the travel distance data Dn obtained when the engine is stopped this time and the travel distance data Dn-1 (stored in the travel distance memory 19) obtained when the engine was stopped the previous time are compared (steps). ST3) If Dn ≧ Dn−1 (YES in step ST3), the process proceeds to step ST5.
[0032]
If Dn ≧ Dn−1 is not satisfied (NO in step ST3), a value Da obtained by subtracting “maximum travel distance by one refueling” from “travel distance when the travel distance meter is reset” and the previous engine stop. Time travel distance data Dn-1 is compared (step ST4), and if Dn-1> Da (YES in step ST4), the process proceeds to step ST5. That is, when Dn-1> Da is established, it is determined that the numerical value indicated by the travel distance meter exceeds the maximum displayable distance and is reset to zero, and the process proceeds to step ST5.
[0033]
Next, the travel distance data detected by the travel distance meter 12 is converted into binary data (step ST5), and this binary data is stored in the travel distance memory 19. Then, this binary number data is used as travel distance data Dn, and the travel distance data Dn stored in the travel distance memory 19 at the previous engine stop is rewritten to data Dn-1 (step ST6). In other words, the travel distance memory 19 stores the travel distance data Dn when the engine is stopped this time and the travel distance data Dn-1 when the engine is stopped last time. It is done.
[0034]
The travel distance data converted into binary numbers is transmitted to the remote unit 2 via the transmitter 16 (step ST7).
[0035]
On the other hand, if Dn-1> Da is not satisfied in the process of step ST4 (NO in step ST4), the travel distance data is transmitted without rewriting the data in the travel distance memory 11.
[0036]
In the remote unit 2, the binary travel distance data transmitted from the in-vehicle unit 3 is received by the receiver 6 (step ST11 in FIG. 3), and the travel distance data is read (step ST12). As in the case of the travel distance memory 19, the newly read travel distance data Dn is stored in the travel distance memory 7 of the remote unit 2 and already stored in the travel distance memory 7. A process of rewriting the travel distance data Dn at the previous engine stop to the data Dn-1 is performed (step ST13).
[0037]
Next, when the driver depresses an operation switch (not shown) of the remote unit 2 to unlock the door of the vehicle 4 (YES in step ST21 in FIG. 4), the code generator 8 of the remote unit 2 The first basic code stored in the code memory 5 and the mileage data Dn-1 at the time of the previous engine stop stored in the mileage memory 7 are read (step ST22), and based on these data, A first rolling code is generated by the first encryption algorithm (step ST23). Here, since the driver once gets off the vehicle and then gets on again to start driving, the driving distance data at the previous engine stop is Dn, and the driving distance data at the previous engine stop is Dn−1. It becomes. A specific description of the encryption algorithm for generating the rolling code will be described later.
[0038]
And the transmission part 9 transmits the produced | generated 1st rolling code to the vehicle-mounted unit 3 (step ST24).
[0039]
In the in-vehicle unit 3, the first rolling code transmitted from the remote unit 2 is received by the receiving unit 10 and further temporarily stored in a storage unit (not shown) of the code decoding unit 17 (in FIG. 5, Step ST31).
[0040]
Next, the code decrypting unit 17 is opposite to the first encryption algorithm used in the code generating unit 8 based on the stored first rolling code and the first basic code stored in the ID code memory 18. The travel distance data Dn-1 is obtained by the algorithm (decoding algorithm) which becomes the procedure of (step ST32).
[0041]
Then, the code verification unit 20 compares the calculated travel distance data Dn-1 with the travel distance data Dn-1 stored in the travel distance memory 19 (step ST33), and confirms a match between them. In this case (YES in step ST33), an operation of automatically unlocking the door lock of the vehicle 4 is performed (step ST34). In addition, since the example about the case where a driving | operation starts is given here, it is set as "unlocking", However, It can carry out similarly about the case where a door lock is locked.
[0042]
When the coincidence of the travel distance data Dn-1 is not confirmed (NO in step ST33), the door is not locked or unlocked. In this way, the driver can lock or unlock the door lock of the vehicle 4 by operating the remote unit 2.
[0043]
Next, an operation for starting the engine after the driver unlocks the door lock of the vehicle 4 by the above-described processing will be described.
[0044]
When the driver detects that the key is inserted into the key cylinder of the vehicle 4 by the starter relay 14 (YES in step ST41 in FIG. 6), the code generation unit 8 of the remote unit 2 uses the mileage memory. 7 is read out (step ST42). Then, based on the first basic code and the second basic code stored in the ID code memory 5 and the two travel distance data Dn and Dn-1, the second rolling algorithm is used to perform the second rolling. A code is generated (step ST43).
[0045]
Thereafter, the generated second rolling code is transmitted from the transmission unit 9 to the in-vehicle unit 3 (step ST44).
[0046]
Further, the receiving unit 10 of the in-vehicle unit 3 receives the second rolling code transmitted from the remote unit 2, and further stores the second rolling code in the storage unit of the code decoding unit 17 once ( Step ST51 in FIG.
[0047]
The code decrypting unit 17 is opposite to the second encryption algorithm based on the second rolling code and the first basic code and the second basic code stored in the ID code memory 18. Travel distance data Dn and Dn-1 are obtained using an algorithm (decoding algorithm) as follows (step ST52).
[0048]
Next, it is determined whether or not the obtained travel distance data Dn and Dn-1 match the travel distance data Dn and Dn-1 stored in the travel distance memory 19 (step ST53). (YES in step ST53), an engine start permission signal is transmitted to the engine ECU (step ST54). Thereby, the engine can be started. Further, when the coincidence between the travel distance data Dn and Dn-1 is not confirmed (NO in step ST53), the engine start is not permitted. That is, only the person carrying the remote unit 2 can start the engine.
[0049]
Next, specific processing for generating a rolling code using the basic code and the travel distance data will be described.
[0050]
FIG. 8 is an explanatory diagram showing a procedure for generating the first rolling code by using the first encryption algorithm.
[0051]
Now, a case where the first basic code is “211059 (decimal)” and the travel distance data Dn−1 is “003038 (decimal display)” will be described. When the first basic code is converted into binary display, the upper 3 digits “211 (decimal)” becomes “11010011 (binary)” and the lower 3 digits “059 (decimal)” becomes “00111011”. (Binary) ”. When this is displayed in hexadecimal, it becomes “D3 (hexadecimal)” and “3B (hexadecimal)”.
[0052]
Similarly, when the travel distance data Dn-1 is converted into a binary display, the upper three digits “003 (decimal)” becomes “00000011 (binary)” and the lower three digits “038 (decimal)”. Becomes “00100110 (binary)”. When this is displayed in hexadecimal, it becomes “03 (hexadecimal)” and “26 (hexadecimal)”.
[0053]
In the first encryption algorithm, an exclusive OR of the binary display data of the first basic code and the binary display data of the mileage data Dn-1 is calculated, and this is calculated as the first rolling algorithm. Code. In this case, the first rolling code is “D01D (hexadecimal)”.
[0054]
The decryption algorithm is a procedure opposite to the above processing procedure.
[0055]
FIG. 9 is an explanatory diagram showing a procedure for generating the second rolling code using the second encryption algorithm.
[0056]
Now, the first basic code is “211059 (decimal)”, the second basic code is “080184 (decimal)”, the travel distance data Dn−1 is “003038 (decimal)”, and the travel distance data Dn. Will be described as “007164 (decimal)”.
[0057]
First, based on the first basic code and the travel distance data Dn-1, code data is generated in the same procedure as the first encryption algorithm described above. That is, the code data obtained here is “D01D (hexadecimal)” as described above. This is the first code data.
[0058]
Similarly, based on the second basic code and travel distance data Dn, code data (second code data) is generated in the same procedure as the first encryption algorithm. As a result, “571C (hexadecimal)” is obtained as the second code data.
[0059]
Then, the second rolling code “8701 (hexadecimal)” is obtained by calculating the exclusive OR of the first code data and the second code data.
[0060]
The decryption algorithm is a procedure opposite to the procedure for generating the second rolling code.
[0061]
Thus, in the vehicle control device 1 according to the present embodiment, when the rolling code is generated based on the travel distance data obtained from the travel distance meter 12 of the vehicle and the collation of the rolling code is confirmed, It is configured to permit locking and unlocking of the door lock of the vehicle 4 and to allow starting of the engine.
[0062]
Therefore, since a random (no regularity) rolling code can be generated at all times, confidentiality can be improved. Even when the driver presses an operation switch (not shown) of the remote unit 2 meaninglessly (regardless of the remote operation), the travel distance data Dn and Dn-1 stored in the remote unit 2 Since the mileage data Dn and Dn-1 stored in the in-vehicle unit 3 coincide with each other, there is no problem that data consistency between the remote unit 2 and the in-vehicle unit 3 cannot be obtained. Remote operation is possible.
[0063]
The rolling code generation method and the vehicle control apparatus using the rolling code according to the present invention have been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each part is the same. Any configuration having a function can be replaced.
[0064]
For example, in the present embodiment, the first encryption algorithm uses the first basic code and the mileage data Dn-1, and the second encryption algorithm uses the first and second basic codes. Although the example using the travel distance data Dn-1 and Dn has been described, the present invention is not limited to this, and the first basic code, the second basic code, and the two travel distance data Dn- It is also possible to generate a rolling code by arbitrarily combining 1 and Dn.
[0065]
Moreover, although the said embodiment demonstrated the example which produces | generates a rolling code using two mileage data of the mileage data Dn-1 at the time of an engine stop the last time, and the mileage data Dn at the time of the last engine stop, 1 It is also possible to generate a rolling code using three or more mileage data.
[0066]
Furthermore, in the above embodiment, an example of controlling the locking of the door lock of the vehicle, the switching of the unlocking, and the permission to start the engine using the rolling cord has been described, but the present invention is not limited to this, It is also possible to configure to control other equipment mounted in the vehicle.
[0067]
Moreover, in the said embodiment, the rolling code transmitted from the remote unit 2 is received in the vehicle-mounted unit 3, the received rolling code is decoded using a decoding algorithm, and the method of confirming the coincidence of mileage data is employ | adopted. However, as a method other than this, the rolling code generated by the in-vehicle unit 3 by the same method as the encryption algorithm used in the remote unit 2, and the rolling code transmitted from the remote unit 2 and the in-vehicle unit It is also possible to configure so as to confirm a match or mismatch with the rolling code generated in step 3.
[0068]
Furthermore, in the above-described embodiment, an example in which exclusive OR is used in the encryption algorithm has been described. However, the present invention is not limited to this, and other logical operations can also be used.
[0069]
【The invention's effect】
As described above, in the rolling code generation method and the vehicle control apparatus using the rolling code according to the present invention, the rolling code is generated using the travel distance data obtained from the travel distance meter mounted on the vehicle, and the door Controls various devices mounted on the vehicle, such as locking / unlocking, permission to start the engine, etc., so it has excellent secrecy and the remote unit's operation button is pressed meaninglessly In this case, it is possible to reliably control the in-vehicle device.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a vehicle control device according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a flow of processing for taking in mileage data used for generating a rolling code into an in-vehicle unit.
FIG. 3 is a flowchart showing a flow of processing for taking travel distance data into a remote unit.
FIG. 4 is a flowchart showing a processing procedure in the remote unit when the door lock is locked and unlocked.
FIG. 5 is a flowchart showing a processing procedure in the in-vehicle unit when the door lock is locked and unlocked.
FIG. 6 is a flowchart showing a processing procedure in the remote unit when starting the engine.
FIG. 7 is a flowchart showing a processing procedure in the in-vehicle unit when starting the engine.
FIG. 8 is an explanatory diagram showing a procedure for generating a first rolling code using a first encryption algorithm;
FIG. 9 is an explanatory diagram showing a procedure for generating a second rolling code using the second encryption algorithm;
FIG. 10 is an explanatory diagram showing a configuration of a keyless entry system according to a first conventional example.
FIG. 11 is an explanatory diagram showing a configuration of a keyless entry system according to a second conventional example.
[Explanation of symbols]
1 Vehicle control device
2 Remote unit
3 In-vehicle unit
4 Vehicle
5 ID code memory
6 Receiver
7 Mileage memory
8 Code generator
9 Transmitter
10 Receiver
11 Microcomputer
12 Mileage meter
13 Interface
14 Starter relay
15 interface
16 Transmitter
17 Code decoding part
18 ID code memory
19 Mileage memory
20 Code verification part

Claims (8)

A method for generating a rolling code to be used when transmitting from a remote unit to an in-vehicle unit mounted on a vehicle and determining whether or not the in-vehicle device can be operated.
When the engine is stopped, the vehicle mileage data is transmitted to the remote unit, and the remote unit stores the mileage data,
The remote unit generates a rolling code that becomes different data each time it is used based on a basic code unique to a vehicle and the travel distance data. A method for generating a rolling code to be used when transmitting from a remote unit to an in-vehicle unit mounted on a vehicle and determining whether or not the in-vehicle device can be operated.
When the engine is stopped, the travel distance data of the vehicle is transmitted to the remote unit, and the remote unit stores a plurality of travel distance data obtained in time series,
Each time the vehicle is used based on the first basic code and the second basic code unique to the vehicle, and the first mileage data and the second mileage data among the plurality of mileage data. A method for generating a rolling code, characterized by generating a rolling code for different data. Opening and closing of the door of the vehicle is permitted based on a combination of at least one of the first basic code and the second basic code and at least one of the first travel distance data and the second travel distance data. Generate the first rolling code to use
Of the combinations of at least one of the first basic code and the second basic code and at least one of the first travel distance data and the second travel distance data, used when generating the first rolling code. The method of generating a rolling code according to claim 2, wherein a second rolling code used for permitting engine start of the vehicle is generated based on a combination different from the combination.   The first travel distance data and the second travel distance data used when boarding the vehicle this time are travel distance data at the time of the last engine stop and travel distance data at the time of the previous engine stop, respectively. The method for generating a rolling code according to claim 2, wherein the rolling code is generated. Data transmission is performed between the remote unit and the vehicle-mounted unit mounted on the vehicle, and the rolling code sent from the remote unit to the vehicle-mounted unit is confirmed to be appropriate. In the vehicle control device for preventing theft,
The in-vehicle unit has transmission means (16) for transmitting the mileage data of the vehicle to the remote unit when the engine is stopped,
The vehicle control apparatus using a rolling code, wherein the remote unit includes code generation means (8) for generating the rolling code based on a vehicle-specific basic code and travel distance data of the vehicle. Data transmission is performed between the remote unit and the vehicle-mounted unit mounted on the vehicle, and the rolling code sent from the remote unit to the vehicle-mounted unit is confirmed to be appropriate. In the vehicle control device for preventing theft,
The in-vehicle unit has transmission means (16) for transmitting the mileage data of the vehicle to the remote unit when the engine is stopped.
The remote unit is
Receiving means (6) for receiving the travel distance data transmitted from the in-vehicle unit;
Based on a combination of at least one of the first basic code and the second basic code unique to the vehicle and at least one of the first travel distance data and the second travel distance data received by the receiving means. Generate a first rolling code,
Of the combinations of at least one of the first basic code and the second basic code, and at least one of the first mileage data and the second mileage data, when the first rolling code is generated has a code generating means that generates a second rolling code based on the different combinations (8) of the combination used,
The in-vehicle unit further includes
A vehicle control apparatus using a rolling code, comprising code decoding means (17) for performing permission judgment of the operation of the in-vehicle device using the first rolling code and the second rolling code. Data transmission is performed between the remote unit and the vehicle-mounted unit mounted on the vehicle, and the rolling code sent from the remote unit to the vehicle-mounted unit is confirmed to be appropriate. In the vehicle control device for preventing theft,
The in-vehicle unit has transmission means (16) for transmitting the mileage data of the vehicle to the remote unit when the engine is stopped.
The remote unit is
Remote side storage means for storing the first travel distance data and the second travel distance data transmitted from the in-vehicle unit;
A first rolling code is generated based on the first basic code unique to the vehicle and at least one of the first mileage data and the second mileage data, and the second basic unique to the vehicle A rolling code generating means for generating a second rolling code based on the code and at least one of the first mileage data and the second mileage data;
The in-vehicle unit further includes
Vehicle-side storage means for storing the first travel distance data and the second travel distance data of the vehicle;
Decoding at least one of the first mileage data and the second mileage data based on the first rolling code and the first basic code transmitted from the remote unit, and from the remote unit A rolling code decoding means for decoding at least one of the first mileage data and the second mileage data based on the transmitted second rolling code and the second basic code;
The first mileage data and the second mileage data decoded by the rolling code decoding means are the first mileage data and the second mileage data stored in the in-vehicle storage means; A matching means for checking whether they match,
When the collation of at least one of the first mileage data and the second mileage data obtained by decoding the first rolling code is confirmed, the vehicle door is locked and unlocked, Means for permitting start of the engine of the vehicle when verification of at least one of the first mileage data and the second mileage data obtained by decoding the rolling code of 2 is confirmed;
A vehicle control apparatus using a rolling cord, comprising:   The first travel distance data and the second travel distance data used when boarding the vehicle this time are travel distance data at the time of the last engine stop and travel distance data at the time of the previous engine stop, respectively. A vehicle control apparatus using the rolling cord according to any one of claims 6 and 7.

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