JP2004238989A - Security device and vehicle with security device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a security device and a vehicle with the security device prevented from registration of an incomplete rolling code even if battery voltage drops. <P>SOLUTION: This security device 19 comprises: a kick pedal 19; a generator (ACG) 1 connected to the kick pedal 19; a power circuit 41 for converting the output voltage of the ACG 1 into a prescribed driving voltage; a capacitor 42 charged by the output voltage of the ACG 1; a memory (EEPROM) 45 for storing the rolling code; a CPU 44 for updating the rolling code; and an AD input circuit 47 for monitoring voltage representing the driving voltage. The CPU 44 stops updating of the rolling code when the driving voltage is lower than the prescribed reference voltage. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a security device and a vehicle with a security device, and more particularly to a security device and a vehicle with a security device that employ a rolling code system in which a personal identification code is rewritten each time verification is performed.
[0002]
[Prior art]
As a security device to prevent the vehicle from being stolen, a security code wirelessly transmitted from a portable terminal owned by a legitimate owner is compared with a security code registered in advance on the vehicle side, and the two agree or have a predetermined relationship. A security device that releases a security lock such as a door lock or a handle lock or permits the engine to be started only when it is confirmed that the security device is in the state described above.
[0003]
However, in recent years, a device that intercepts a security code included in a signal of wireless communication reproduces the security code and transmits the same security code, so that a person other than the authorized owner illegally uses the security code. Action has been reported.
[0004]
In order to solve such a problem, in Japanese Patent Application Laid-Open No. 1-278671, in addition to a fixed ID code, a rolling code for progressively changing code numbers in a predetermined order according to the number of outgoing calls is provided. A rolling code method has been proposed in which an ID code and a rolling code are combined to generate a personal identification code.
[0005]
FIG. 5 is a block diagram showing a configuration of a main part of a security device employing a conventional rolling code system, and includes a portable terminal owned by a driver and an in-vehicle device mounted on a vehicle.
[0006]
The portable terminal includes a key operation unit 51, an ID code memory 52 in which an ID code is fixedly stored, a rolling code generation unit 53 that progressively changes a rolling code according to the number of key operations, And a rolling code, to generate a personal identification code, a modulation part 55 for modulating the personal identification code, and a transmission part 56 for transmitting the modulated personal identification code.
[0007]
The in-vehicle device includes a receiving unit 61 that receives the security code, a demodulation unit 62 that demodulates the received security code, and analyzes the security code and compares the ID code with the ID code stored in the ID code memory 63. Further, the data analyzing unit 65 compares the rolling code with the number of receptions stored in the reception number adding unit 64, and determines the validity of the personal identification code based on the comparison result. And a drive unit 66 for releasing a security lock such as a lock or a handle lock. The data analysis unit 65 further has a function of incrementing the number of receptions registered in the number-of-times-of-reception adding unit 64 and updating and registering the number when the validity of the personal identification code is confirmed.
[0008]
[Problems to be solved by the invention]
In the security device employing the above-described rolling code system, when the updated rolling code is registered in the memory (the number-of-receptions adding unit 64) and the battery voltage drops, an incomplete rolling code is written in the memory. Would. Therefore, at the time of the next transmission, the rolling code of the mobile terminal and the rolling code of the vehicle do not match, so that there is a technical problem that the security lock cannot be released even though the legitimate mobile terminal is used. there were.
[0009]
An object of the present invention is to solve the above-described problems of the related art and to provide a security device and a vehicle with a security device in which an incomplete rolling code is not registered even when the battery voltage is low.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention receives a rolling code, compares it with a registered rolling code, releases a security lock when both are in a predetermined relationship, and updates the registered rolling code. The security device and the vehicle with the security device are characterized by taking the following measures.
[0011]
(1) A memory for storing a rolling code, updating means for updating the rolling code, and monitoring means for monitoring a voltage representing a driving voltage of the memory and the updating means, wherein the updating means drives the memory and the updating means. When the voltage representative of the voltage is lower than a predetermined reference voltage, the updating of the rolling code is stopped.
[0012]
(2) Further provided are a kick pedal, a generator connected to the kick pedal, a power supply circuit for converting an output voltage of the generator into a predetermined drive voltage, and a power storage means charged by the output voltage of the generator. .
[0013]
(3) The received rolling code is compared with the registered rolling code, and when both match or the difference is equal to or less than a predetermined allowable value, the security lock is released.
[0014]
According to the above feature (1), the update registration of the rolling code is prohibited in a situation where the driving voltages of the memory and the updating unit are low and the rolling code cannot be accurately registered in the memory. Therefore, it is possible to prevent an incomplete rolling code from being registered in the memory.
[0015]
According to the above feature (2), the power generated by kicking the kick pedal is stored in the power storage means, and the security device can be operated by the power, so that the security can be maintained even when the battery voltage is low. The lock can be released.
[0016]
According to the above feature (3), as a result of the drive voltage falling below the reference voltage, only the rolling code on the mobile terminal is updated, and the rolling code on the in-vehicle device is not updated, and a slight difference occurs between the two. Inconvenience does not occur at the next collation.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external side view of a scooter-type motorcycle to which the security device of the present invention is applied, wherein a vehicle body front portion 1 and a vehicle body rear portion 2 are connected via a low floor portion 3, and a skeleton of those portions. Is generally formed by a body frame composed of a down tube and a main pipe.
[0018]
The front part 1, the rear part 2 and the floor part 3 of the vehicle body are covered with a front cover 4, a body cover 5 and a center cover 6, respectively. A handlebar 7 is provided at the upper part of the vehicle body front part 1 so as to be pivotally supported by the steering head, a front fork 8 extends downward, and a front wheel 9F is pivotally supported at a lower end thereof.
[0019]
A swing unit 20 is swingably connected to and supported by a lower end of the rising portion of the main pipe 7 via a link member 18. A four-cylinder four-cycle engine 13 is mounted at the front of the swing unit 20. A kick pedal 19 for starting the engine when the battery voltage drops is connected to the crankshaft of the engine 13. A belt-type continuously variable transmission 21 is formed from the engine 13 to the rear, and a rear wheel 9R is pivotally supported by a reduction mechanism 14 provided at a rear portion thereof via a centrifugal clutch. A rear cushion 15 is interposed between the upper end of the speed reduction mechanism 14 and the main pipe.
[0020]
The upper part of the handle 7 is covered with a handle cover 10 also serving as an instrument panel. The steering head, the front fork 8 and the handle 7 constitute steering means. A grip portion of the handle 7 protrudes from the handle cover 10 to the left and right of the vehicle body, and a side mirror 11L (11R) protrudes upward. The handle lock module 12 locks the handle 7 to disable steering.
[0021]
A seat 16 is provided above the body cover 5 so as to cover the storage box. The seat 16 can be opened and closed, and a helmet or the like can be stored in a storage box below the seat 16. The rear part of the body cover 5 is provided with a number plate mounting part 17, a carrier, a tail lamp, and the like. An intake pipe, a carburetor, an air cleaner, and the like are also provided along with the engine, but are not shown.
[0022]
FIG. 2 is a block diagram showing a configuration of a main part of an electrical system including a security device mounted on the motorcycle, and the same reference numerals as those described above denote the same or equivalent parts.
[0023]
An alternating current generator (ACG) 31 is connected to the crankshaft of the engine 13 and to the kick pedal 19. The regulator 33 controls the output voltage of the ACG 31 to a predetermined voltage and supplies it to the security unit 40 and the battery 35, supplies the same to each electric component via the main relay 36, and supplies the ignition circuit via the ignition switch 37. I do. The lock actuator 38 unlocks the handle lock module 12 in response to a signal from the security unit 40.
[0024]
In the security unit 40, a power supply circuit 41 converts a battery voltage supplied to an input terminal into a predetermined logic voltage. A capacitor (or storage battery) 42 is connected to an input terminal of the power supply circuit 41. The receiver 43 includes a reception unit and a demodulation unit, receives a personal identification code transmitted from the mobile terminal, converts the personal identification code into a digital signal, and provides the digital signal to the CPU 44.
[0025]
The rolling code is stored in the EEPROM 45. The ID code is fixedly registered in the ROM 46. The AD input circuit 47 performs A / D conversion of the power supply voltage V2 (terminal voltage of the capacitor 42) of the power supply circuit 41 and provides the result to the CPU 44. The switch input circuit 48 detects the state of various switches. CPU 44 includes a data analysis unit and a rolling code update unit.
[0026]
FIG. 3 shows signal waveforms at various points in FIG. 2 at the time of kick starting when the battery voltage drops.
[0027]
When the kick pedal 19 is kicked at time t1 and the ACG 31 is rotated, the power supply voltage V1 of the security unit 40 increases as shown in FIG. The power supply voltage V2 of the power supply circuit 41 also rises as the power supply voltage V1 rises as shown in FIG. 3B, so that the capacitor 42 is charged and thereafter gradually falls. The drive voltage V3 output from the power supply circuit 41 increases with the rise of the power supply voltage V2 until reaching the predetermined logic voltage Vlog, and is maintained at the logic voltage Vlog while the power supply voltage V2 exceeds the logic voltage Vlog. . Thereafter, when the power supply voltage V2 gradually decreases and falls below the logic voltage Vlog, the drive voltage V3 also gradually decreases accordingly.
[0028]
Here, the operation assurance voltage Vcpu of the CPU 44 and the operation assurance voltage Veeprom of the EEPROM 45 have a relationship of Veeprom <Vcpu, and as the drive voltage V3 decreases, the CPU 44 and the EEPROM 45 fall into an inoperable state in this order. Therefore, in order to normally finish the update registration of the rolling code in the EEPROM 45, the drive voltage V3 output from the power supply circuit 41 continues to exceed the operation guarantee voltage Vcpu of the CPU 44 during the period from the start to the end of the writing to the EEPROM 45. There is a need.
[0029]
Therefore, in the present embodiment, as shown in FIG. 3C, at least the time Δt required for writing the rolling code to the EEPROM is earlier than the timing t3 when the gradually decreasing drive voltage V3 falls below the operation guarantee voltage of the CPU 44. The power supply voltage V2 at the timing t2 is registered as the reference voltage Vref, and only when the power supply voltage V2 exceeds the reference voltage Vref, the update registration of the rolling code to the EEPROM 45 is permitted.
[0030]
FIG. 4 is a flowchart mainly showing the operation of the CPU 44. In step S1, it is determined whether or not a password is received by the receiver 43. When the reception of the password is confirmed, in step S2, the data analysis unit of the CPU 44 analyzes the password and extracts the ID code and the rolling code included therein.
[0031]
In step S3, the ID code extracted from the password is compared with the ID code registered in the ROM 46. If the two match or have a predetermined relationship, the current ID code is recognized as a regular ID code. And proceed to step S4. In step S4, the rolling code extracted from the password is compared with the rolling code registered in advance in the EEPROM 45. If the two match or have a predetermined relationship, the current rolling code is replaced with the regular rolling code. Recognize and proceed to step S5.
[0032]
In step S5, a release signal is transmitted to the lock actuator 38. The lock actuator 38 urges the handle lock module 12 in response to the release signal to release the door lock. In step S6, the magnitude relationship between the power supply voltage V2 and the reference voltage Vref is determined based on the signal supplied from the AD input circuit 47. If V2 ≧ Vref, the power supply voltage is sufficiently high and the update registration of the rolling code can be completed normally, so that the process proceeds to step S7. In step S7, the rolling code registered in the EEPROM 45 is updated. If V2 <Vref, the process ends without updating the rolling code.
[0033]
As described above, according to the present embodiment, the power supply voltage V2 is checked when the rolling code is updated and registered in the EEPROM 45. If the power supply voltage V2 is lower than the reference voltage Vref, the update registration is prohibited. Therefore, registration of an incomplete rolling code in the EEPROM 45 is prevented.
[0034]
In the above-described embodiment, when the rolling code is transmitted in a state where the power supply voltage V2 is lower than the reference voltage Vref, only the rolling code of the mobile terminal is updated, and the rolling code of the in-vehicle device is not updated. There is a slight difference between the two. However, in the present embodiment, even when the rolling codes do not match, if the difference is equal to or less than a predetermined allowable value, this is determined to be “matching” in consideration of idle pressing of the key switch in the mobile terminal. To release the security lock. Therefore, even when the update registration of the rolling code on the vehicle-mounted device side is prohibited when the power supply voltage V2 is lower than the reference voltage Vref as in the present embodiment, no inconvenience occurs at the next collation.
[0035]
Further, in the above embodiment, the case where the handle lock is adopted as the security lock has been described as an example. However, the present invention can be similarly applied to a security system in which power supply to the ECU and the ignition device is cut off and the engine cannot be started.
[0036]
【The invention's effect】
According to the present invention, the following effects are achieved.
(1) The power supply voltage is checked when the rolling code is updated and registered in the memory, and if the power supply voltage is lower than the reference voltage, the update registration is prohibited, so that incomplete data registration in the memory is prevented. .
(2) Since the power generated by kicking the kick pedal is stored in the power storage means and the power can be used to operate the security device, the security lock can be released even when the battery voltage is low. .
(3) The received rolling code is compared with the registered rolling code, and the security lock is released not only when the two match, but also when the difference between the two is equal to or less than a predetermined allowable value. As a result of the drive voltage dropping below the reference voltage, even if only the rolling code on the mobile terminal is updated and the rolling code on the in-vehicle device is not updated but there is a slight difference between them, no inconvenience will occur during the next verification.
[Brief description of the drawings]
FIG. 1 is an external side view of a scooter type motorcycle to which a security system according to the present invention is applied.
FIG. 2 is a block diagram showing a configuration of a main part of an electrical system including a security system of the present invention.
FIG. 3 is a signal waveform diagram of a main part of FIG. 2 at the time of starting a kick when the battery voltage drops.
FIG. 4 is a flowchart showing an operation of one embodiment of the present invention.
FIG. 5 is a block diagram of a conventional vehicle anti-theft system employing a rolling code as a personal identification code.
[Description of Signs] 4 Front cover, 5 Body cover, 6 Center cover, 7 Handle, 12 Handle lock module, 13 Engine, 14 Reduction mechanism, 18 Link member, 19 Kick pedal, 20 Swing unit, 21: belt-type continuously variable transmission, 31: alternating current generator (ACG), 35: battery, 36: main relay, 37: ignition switch, 40: security unit

Claims (7)

In a security device that receives a rolling code, compares it with a registered rolling code, releases a security lock when both have a predetermined relationship, and updates the registered rolling code,
A memory for storing the rolling code;
Updating means for updating the rolling code;
Monitoring means for monitoring a voltage representative of the drive voltage of the memory and the updating means,
The security device, wherein the updating unit stops updating the rolling code when a voltage representing the driving voltage is lower than a predetermined reference voltage. A power supply circuit for converting an external input voltage to the drive voltage,
The security device according to claim 1, further comprising: a power storage unit that is charged by the input voltage. The security device according to claim 2, wherein the monitoring unit monitors a terminal voltage of the power storage unit. 4. The security lock according to claim 1, wherein the received rolling code is compared with a registered rolling code, and the security lock is released when the two match or the difference is equal to or less than a predetermined allowable value. Security device. In a vehicle with a security device that receives a rolling code, compares it with a registered rolling code, releases a security lock when both have a predetermined relationship, and updates the registered rolling code,
Kick pedal,
A generator connected to the kick pedal,
A power supply circuit for converting the output voltage of the generator into a predetermined drive voltage,
Power storage means charged by the output voltage of the generator,
A memory that is driven by the driving voltage and stores the rolling code;
Updating means driven by the driving voltage to update the rolling code;
Monitoring means for monitoring a voltage representative of the drive voltage,
The vehicle with a security device, wherein the updating unit stops updating the rolling code when a voltage representing the driving voltage is lower than a predetermined reference voltage. The vehicle with a security device according to claim 5, wherein the monitoring unit monitors a terminal voltage of the power storage unit. 7. The security device according to claim 5, wherein the received rolling code is compared with a registered rolling code, and a security lock is released when a match or a difference is equal to or less than a predetermined allowable value. vehicle.

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