JP2004359036A - Anti-theft system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-theft system for a vehicle capable of securing high security property in a relatively simple constitution and realizing a more speedy engine start from a key turn. <P>SOLUTION: The anti-theft system for the vehicle comprises a drive controlling means for controlling an operation of a drive source for the vehicle, a plurality of on-vehicle units, and a unit selecting means for selecting at least one on-vehicle unit from the plurality of on-vehicle units in a random order. The unit selecting means transmits a predetermined code to the selected on-vehicle unit, predicts a code fed back through the on-vehicle unit, and, when the predicted code matches with the actually fed back code, permits the operation of the drive source. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-theft system for a vehicle.
[0002]
[Prior art]
Conventionally, as an anti-theft device for a vehicle, an immobilizer that starts an engine by determining whether a key code transmitted from an ignition key via a key sensor matches a legitimate code is known. Have been. In such an apparatus, an immobilizer electronic control unit (ECU: Electronic Control Unit) that stores a proper code and determines whether the key code is correct is replaced with an electronic control unit having no immobilizer function for some reason. Since the key code collation function does not operate, the engine can be started and the vehicle may be stolen. In view of such a problem, in recent years, there has been a demand for a vehicle anti-theft method that ensures higher security in order to cope with a case where a component unit provided in advance in a vehicle is replaced.
[0003]
As a system for achieving high security, for example, Japanese Patent Application Laid-Open No. H10-238444 (Patent Literature 1) discloses a system in which, when an engine is started, a key code transmitted from an ignition key is checked in addition to an immobilizer ECU. An immobilizer system is disclosed in which a plurality of ECUs, such as an ECU for meter and an ECU for meter, perform an engine start only when collation matches are recognized by all of these ECUs.
[0004]
[Patent Document 1]
JP-A-10-238444 (pages 3 to 5, FIGS. 1 to 4)
[0005]
[Problems to be solved by the invention]
However, in the above system, there is a problem that it takes a long time to perform the collation by all the ECUs, so that it takes a long time from the rotation of the ignition key to the start of the engine. In connection with this, according to an experiment performed by the inventor of the present application, it has been found that if it takes about 0.21 second or more from the rotation of the key to the start of the engine, the user will feel uncomfortable. Was done.
[0006]
The present invention has been made in view of the above technical problem, and has a relatively simple configuration, can ensure high security, and can realize a more rapid engine start from key rotation. It is intended to provide an anti-theft system.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 of the present application is an anti-theft system for a vehicle, the system comprising at least a drive control unit for controlling an operation of a drive source for a vehicle, a plurality of on-vehicle units, and at least a plurality of on-vehicle units. Unit selection means for randomly selecting one in-vehicle unit, wherein the unit selection means transmits a predetermined code to the selected in-vehicle unit and a code returned via the in-vehicle unit. The invention is characterized in that the operation of the drive source is permitted when the predicted code matches the code actually returned.
[0008]
The invention according to claim 2 of the present application is the invention according to claim 1, wherein each of the on-vehicle units has unique data, and the on-vehicle unit selected by the unit selection unit is: From the transmitted code and the unique data, a new code is calculated and output.On the other hand, the unit selecting means calculates the code to be transmitted to the selected on-vehicle unit and the unique data associated with each on-vehicle unit. It is characterized by predicting a code sent back via each in-vehicle unit.
[0009]
Further, the invention according to claim 3 of the present application is characterized in that, in the invention according to claim 1 or 2, the unit selection means is incorporated in the drive control means.
[0010]
Further, the invention according to claim 4 of the present application is the invention according to any one of claims 1 to 3, wherein the unit selection means selects a plurality of on-vehicle units simultaneously, and for all on-vehicle units, And predicting the code sent back via the control unit, and when the predicted code matches the code actually sent back, the operation of the drive source is permitted via the drive control means. Things.
[0011]
Further, the invention according to claim 5 of the present application is the invention according to any one of claims 1 to 4, wherein the unit selection unit is configured to disable the operation of the drive source when the unit selection unit is disabled. Having a storage means for storing the selected on-vehicle unit, and thereafter, when a predetermined code is input from the unit selection means, selecting the on-vehicle unit stored in the storage means. It is.
[0012]
Further, according to a sixth aspect of the present invention, in any one of the first to fifth aspects, at least a part of the plurality of on-vehicle units is multiplex-communicated with each other by a controller area network (CAN). It is characterized by being connected as possible.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram showing a basic configuration of a vehicle anti-theft system according to Embodiment 1 of the present invention. This anti-theft system is configured by a unit that is standardly provided in a vehicle. In the present embodiment, the engine control unit 10 as a main unit, the keyless unit 32 as another on-vehicle unit, It comprises a meter unit 3, an ABS unit 4, a tire pressure monitor unit 5, and an air conditioner unit 6. These units are connected to each other by a car area network (CAN: Controller Area Network) so as to be capable of multiplex communication.
[0014]
The engine control unit 10 is a unit that controls the driving of the engine 20 such as outputting a signal for permitting the engine 20 to start, as is conventionally known. In the present invention, the engine control unit 10 determines whether to permit the engine start. Is finally determined. The keyless unit 32 is a known unit that locks and unlocks a door and the like from outside the vehicle in response to a keyless signal. When the key 1 is inserted into a key cylinder (not shown) and rotated to the “ON” position, a signal is emitted from the coil antenna 21. In response to the signal, a response signal is emitted from a transponder (not shown) built in the key 1, and the response signal is received by the coil antenna 21. In the present embodiment, the function of transmitting and receiving signals from the coil antenna 21 is incorporated in the keyless unit 32. However, the present invention is not limited to this, and such a function may be incorporated in another unit. Good.
[0015]
The meter unit 3 is a unit for controlling various meters incorporated in the instrument panel of the vehicle. An ABS (antilock breaking system) unit 4 is a unit for stabilizing the posture of the vehicle by preventing wheels from being locked, for example, at the time of sudden braking or braking on a slippery road surface. Further, the tire pressure monitor unit 5 is a unit for monitoring the tire air pressure in order to secure running stability. Further, the air conditioner unit 6 is a unit for air conditioning inside the vehicle.
[0016]
In the present embodiment, when the driver rotates the key 1, the engine control unit 10 that senses the rotation first selects some of the plurality of units as communication destinations, and selects one of the selected units. Then, a randomly generated code (hereinafter, random value) is transmitted. When each unit receives the random value, it generates a new random value based on the random value and transmits it to the other units. The last of the selected units sends the generated random value to the engine control unit 10. The engine control unit 10 predicts a random value transmitted from the last unit based on information on the selected unit, and compares the predicted random value with the actually transmitted random value. When the two random values match, the engine control unit 10 outputs to the engine 20 a signal permitting the start. Thus, the authentication operation is performed.
[0017]
In order to perform the authentication operation, the engine control unit 10 determines the number of communication destinations and the communication destination and communication destination determination unit 10A that determines the communication destination in accordance with the rotation of the key 1, and a random number that is transmitted to other units. A random value generation unit 10B for generating a value, and a value transmitted from each unit using a predetermined algorithm based on the generated random value and unique data (serial number) set for each unit. And a memory 10D for storing an algorithm used in the arithmetic unit 10C and a predetermined serial number.
[0018]
Further, the keyless unit 32, the meter unit 3, the ABS unit 4, the tire pressure monitor unit 5, and the air conditioner unit 6 use the predetermined algorithm based on the transmitted random value and the unique serial number, respectively. Arithmetic units 32A, 3A, 4A, 5A, 6A for generating random values to be transmitted to the unit or the engine control unit 10, and memories 32B, 3B, 4B, 5B for storing an algorithm used in each arithmetic unit and a unique serial number. , 6B.
[0019]
FIG. 2 shows a signal flow at the time of an authentication operation by the vehicle anti-theft system having the above configuration. Here, the case where the engine control unit 10 selects two units of the ABS unit 4 and the keyless unit 32 as the transmission destination will be described as an example. The flow of each signal is represented by arrows with circled numbers. As shown in FIG. 2, the units excluding the engine control unit 10, that is, the ABS unit 4, the tire pressure monitor unit 5, the meter unit 3, the keyless unit 32, and the air conditioner unit 6, each have a unique serial number. “Serial # Abs”, “Serial # Tpm”, “Serial # Clu”, “Serial # Rke”, and “Serial # Ac” are stored, and a common algorithm is held. On the other hand, the engine control unit 10 stores the serial numbers of all the other units and has an algorithm common to the other units.
[0020]
First, an arrow {circle around (1)} indicates a signal flow for notifying the engine control unit 10 of the rotation of the key 1. Upon receiving the signal, the engine control unit 10 selects two of the ABS unit 4 and the keyless unit 32 from the various units by the number of communication destinations and the communication destination determination unit 10A (see FIG. 1). At the same time, a random value X is generated by using the random value generating unit 10B.
[0021]
Subsequently, the engine control unit 10 transmits the generated random value X to one of the selected units (the ABS unit 4 in this example), as indicated by the arrow (2). The ABS unit 4 generates a new random value Y from the transmitted random value X and the serial number “Serial # Abs” using an algorithm. Thereafter, the ABS unit 4 transmits the generated random value Y to the keyless unit 32, which is the other unit selected by the engine control unit 10, as indicated by the arrow (3).
[0022]
The keyless unit 32 generates a new random value Z from the transmitted random value Y and the serial number “Serial # Rke” using an algorithm. Thereafter, the keyless unit 32 transmits the generated random value Z to the engine control unit 10 as indicated by the arrow (4).
[0023]
The engine control unit 10 transmits the random value X generated as described above to the ABS unit 4, and also stores the random value X and the serial number “Serial # Abs” for the selected unit (that is, the ABS unit 4 and the keyless unit 32). , "Serial # Rke", an algorithm is used to calculate a predicted value of the random value Z sent back to the engine control unit 10 from the last selected unit (in this case, the keyless unit 32).
[0024]
Then, the engine control unit 10 compares the calculated value with the random value Z actually sent to the keyless unit 32, and when they match, the engine control unit 10 sends the calculated value to the engine 20 as indicated by an arrow (5). Send a signal to allow starting. As a result, the engine 20 turns on the starter relay, and permits ignition and injection.
[0025]
FIG. 3 is a flowchart illustrating an authentication operation performed by the vehicle antitheft system. In this operation, first, it is determined whether or not all the units registered in advance are connected according to the rotation (IG-ON) of the key 1 (S11). As a result, if YES, the process advances to S12; if NO, the authentication operation ends. That is, when all the units are not connected, the start of the engine 20 is not permitted.
[0026]
Next, the engine control unit (PCM) 10 determines the number of communication destinations n and the communication destinations (m ₁ , m ₂ , m ₃ ,..., _Mn ) and generates an initial value _Ro of a random value. (S12). Then, send the R from the engine control unit 10 to the unit _{m i} (S13). At this time, i = 1 and R = 0.
[0027]
Furthermore, the unit _{m i} is the serial number _{S i} of the random value R and each unit comprising, using an algorithm _{f i} where each unit's, a new random value _R = f i _(S i, R) It is calculated (S14). Subsequently, i is set to i + 1 (S15). Then, it is determined whether or not n is greater than or equal to i (S16). That is, it is determined whether or not the processing in step S14 is not completed in the selected unit. As a result, if it is YES, it sends the random value R to the next unit _{m i} (S17).
[0028]
On the other hand, if NO, the last unit selected returns the final random value R to the engine control unit 10 (S18). Next, the engine control unit 10 collates the final random value R sent from the last unit with a predicted value and determines whether or not both values match (S19). . As a result, if the result is YES, a signal for permitting the start is transmitted to the engine 20 (S20). Thus, the authentication operation ends.
On the other hand, if NO, no signal is transmitted to the engine 20 and the start of the engine 20 is prohibited. Thus, the authentication operation ends.
[0029]
As described above, in this vehicle anti-theft system, in response to the rotation of the key 1, the engine control unit 10 determines whether the random value generated through some other vehicle-mounted units and the random value calculated by itself. Since authentication is performed by comparing the predicted value with a predicted value, high security can be achieved with a relatively simple configuration. Such a vehicle anti-theft system is effective when incorporated into a vehicle that is not equipped with an immobilizer system or a vehicle that is originally equipped. In addition, even when there are vehicles equipped with an immobilizer system and vehicles not equipped with the immobilizer system in the same vehicle type, high security can be ensured by using such a vehicle anti-theft system.
In addition, in this vehicle anti-theft system, several are selected from a plurality of in-vehicle units, so that authentication is performed more quickly than in the case where all in-vehicle units are used. The time is relatively short.
[0030]
In order to ensure higher security, the engine control unit 10 stores the selected on-vehicle unit in the memory 10D when the engine start is not permitted, and thereafter stores the selected in-vehicle unit in the memory 10D. A unit other than the in-vehicle unit may be selected.
[0031]
Embodiment 2 FIG.
Next, a second embodiment of the present invention will be described. In the following, the same components as those in the first embodiment are denoted by the same reference numerals, and further description is omitted.
FIG. 4 shows a signal flow during an authentication operation by the vehicle antitheft system according to Embodiment 2 of the present invention. In the first embodiment, as shown in FIG. 2, a random value finally generated among a plurality of units selected by the engine control unit 10 is returned to the engine control unit 10. In the second embodiment, authentication is performed by sending a random value back to the engine control unit 10 for each selected unit.
[0032]
Also in this case, similarly to the first embodiment, the units excluding the engine control unit 10, that is, the ABS unit 4, the tire pressure monitor unit 5, the meter unit 3, the keyless unit 32, and the air conditioner unit 6 are each unique. The serial numbers "Serial # Abs", "Serial # Tpm", "Serial # Clu", "Serial # Rke", and "Serial # Ac" are stored, and a common algorithm is held. On the other hand, the engine control unit 10 stores the serial numbers of all the other units and has an algorithm common to the other units.
[0033]
When the engine control unit 10 receives the signal indicating the rotation of the key 1 as indicated by the arrow (1) in FIG. 4, the engine control unit 10 determines the number of communication destinations and the communication destination determining unit 10A (see FIG. 1), among the various units. , The ABS unit 4 and the keyless unit 32 are selected. At the same time, a random value X is generated by using the random value generating unit 10B.
[0034]
Subsequently, the engine control unit 10 transmits the generated random value X to one of the selected units (the ABS unit 4 in this example), as indicated by the arrow (2). The ABS unit 4 generates a new random value Y from the transmitted random value X and the serial number “Serial # Abs” using an algorithm. Thereafter, the ABS unit 4 sends back a random value Y to the engine control unit 10 as indicated by the arrow (3).
[0035]
The engine control unit 10 transmits the random value X generated as described above to the ABS unit 4 and, based on the random value X and the serial number “Serial # Abs” relating to the ABS unit 4, uses the ABS unit 4 to calculate the predicted value of the random value Y sent back to the engine control unit 10. Then, the calculated value is compared with the actually sent random value Y, and if both match, as indicated by an arrow (4), the other of the first selected unit (in this case, the keyless Send the random value X to the unit 32).
[0036]
The keyless unit 32 generates a new random value Z from the transmitted random value X and the serial number “Serial # Rke” using an algorithm. Thereafter, the keyless unit 32 sends back the random value Z to the engine control unit 10 as indicated by the arrow (5).
[0037]
The engine control unit 10 transmits the random value X generated as described above to the keyless unit 32, and, based on the random value X and the serial number “Serial # Rke” related to the keyless unit 32, uses an algorithm to execute the keyless unit The predicted value of the random value Z sent back from 32 to the engine control unit 10 is calculated. Then, the calculated value is compared with the actually sent random value Z, and if they match, a signal is sent to the engine 20 to permit the engine 20 to start, as indicated by an arrow (6). As a result, the engine 20 turns on the starter relay, and permits ignition and injection.
[0038]
As described above, in the second embodiment, the authentication is performed such that a random value is sent back to the engine control unit 10 for each unit selected by the engine control unit 10. In this case, the authentication is also performed in this case. As in the first embodiment, high security can be realized, and some of the on-vehicle units are selected, so that the authentication is performed more quickly than when all the on-vehicle units are used, and the key is used. The time from turning to starting the engine is relatively short.
[0039]
The present invention is not limited to the illustrated embodiment, and it goes without saying that various improvements and design changes can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the engine control unit 10 selects another in-vehicle unit and is treated as a main unit that performs final collation. However, the present invention is not limited to this. May be provided separately or in another on-vehicle unit for selecting the on-vehicle unit and providing means for collation.
The on-vehicle unit other than the engine control unit 10 that generates a new random value from the transmitted random value is not limited to the one disclosed in the above-described embodiment. Any unit capable of communication (such as a traction unit) may be used.
Furthermore, although the type of vehicle is not limited in the above-described embodiment, the present invention is applicable to any vehicle such as a normal, large, and special vehicle.
[0040]
【The invention's effect】
As is apparent from the above description, according to the first aspect of the present invention, the unit selecting unit collates the code generated through some other on-vehicle units with the code predicted by itself. Therefore, high security can be realized with a relatively simple configuration. In addition, in this vehicle anti-theft system, by selecting some from a plurality of in-vehicle units, authentication can be performed more quickly than in the case where all in-vehicle units are used. The time to start can be shortened.
[0041]
Further, according to the invention of claim 2 of the present application, each of the on-vehicle units has unique data, and the on-vehicle unit selected by the unit selecting means is provided with the transmitted code and the From the unique data, a new code is calculated and output, while the unit selection means transmits the code to the selected on-vehicle unit and the unique data related to each on-vehicle unit via the on-vehicle unit. Since the authentication is performed by predicting the returned code and comparing the predicted code with the code returned from the in-vehicle unit, high security can be ensured.
[0042]
Furthermore, according to the invention of claim 3 of the present application, since the unit selecting means is incorporated in the drive control means, it is not necessary to provide each unit as a separate configuration, and the configuration can be simplified.
[0043]
Further, according to the invention of claim 4 of the present application, the unit selecting means simultaneously selects a plurality of on-vehicle units, and predicts, for all the on-vehicle units, a code sent back via the on-vehicle unit. When the predicted code matches the code that is actually sent back, the operation of the drive source is permitted via the drive control means, so that high security can be ensured.
[0044]
Further, according to the invention according to claim 5 of the present application, when the unit selection means rejects the operation of the drive source, the storage means for storing the on-vehicle unit selected by the unit selection means is provided. If a predetermined code is input from the unit selecting means thereafter, higher security can be ensured by selecting the in-vehicle unit stored in the storage means.
[0045]
Further, according to the invention according to claim 6 of the present application, at least a part between the plurality of on-vehicle units is connected so as to be capable of multiplex communication with each other by a controller area network (CAN). , High-speed communication is possible, and authentication can be performed quickly.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a vehicle anti-theft system according to Embodiment 1 of the present invention.
FIG. 2 is an explanatory diagram showing a signal flow at the time of an authentication operation by the vehicle anti-theft system.
FIG. 3 is a flowchart illustrating an authentication operation performed by the vehicle anti-theft system.
FIG. 4 is an explanatory diagram showing a signal flow at the time of an authentication operation by the vehicle antitheft system according to the second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Key 3 ... Meter unit 3A ... Calculator 3B ... Memory 4 ... ABS unit 4A ... Calculator 4B ... Memory 5 ... Tire pressure monitor unit 5A ... Calculator 5B ... Memory 6 ... Air conditioner unit 6A ... Calculator 6B ... Memory 10 ... Engine control unit 10A ... Number of communication destinations and communication destination determination unit 10B ... Random value generation unit 10C ... Operation unit 10D ... Memory 11 ... CAN
21 ... Coil antenna 32 ... Keyless unit 32A ... Calculation unit 32B ... Memory

Claims (6)

Drive control means for controlling the operation of the vehicle drive source;
Multiple on-board units,
Unit selection means for randomly selecting at least one vehicle-mounted unit from the plurality of vehicle-mounted units,
The unit selecting means transmits a predetermined code to the selected on-vehicle unit, predicts a code sent back via the on-vehicle unit, and, when the predicted code matches the code actually sent back. A vehicle anti-theft system for permitting operation of the drive source. Each of the on-vehicle units has unique data, and the on-vehicle unit selected by the unit selecting means calculates and outputs a new code from the transmitted code and the unique data. While
2. The vehicle according to claim 1, wherein the unit selection unit predicts a code to be sent back via each on-vehicle unit from a code to be transmitted to the on-vehicle unit and a unique data associated with each on-vehicle unit. Anti-theft system. 3. The vehicle anti-theft system according to claim 1, wherein the unit selection means is incorporated in the drive control means. The unit selection means simultaneously selects a plurality of on-vehicle units, predicts a code sent back via the on-vehicle unit for all the on-vehicle units, and matches the predicted code with the code actually sent back. The vehicle anti-theft system according to any one of claims 1 to 3, wherein operation of the drive source is permitted via the drive control means. The unit selection means has storage means for storing the on-vehicle unit selected by the unit selection means when the operation of the drive source is disallowed, and thereafter, a predetermined code is inputted from the unit selection means. The vehicle anti-theft system according to any one of claims 1 to 4, wherein the vehicle-mounted unit stored in the storage means is selected when there is an error. The vehicle theft according to any one of claims 1 to 5, wherein at least a part of the plurality of on-vehicle units is connected to each other via a controller area network (CAN) so as to be capable of multiplex communication. Prevention system.

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