JPH1091876A - Burglar preventing device for on-vehicle acoustic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bugler preventing device for an on-vehicle acoustic equipment having a burglar prevention function being hardly released by a thief. SOLUTION: This device is provided with an EEPROM 20 which stores a set password code, a control key 22 which inputs an input code, and a microcomputer 24 which compares the above mentioned input code with the password code when a power is supplied to an on-vehicle acoustic equipment, and releases a robber preventing mode when those input code and password code are made incident. At the time of detecting the incoincidence of the input code and the password code, this microcomputer 24 counts the number of times of this incoincidence as an erroneous input count value, and starts a timer 21 for clocking a prescribed time as long as it is judged that the erroneous input count value is beyond a prescribed count value, and a special operation by the control key 22 is executed, and releases a set non-allowable mode after the lapse of the prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antitheft device for on-vehicle audio equipment for preventing the theft of audio equipment mounted in a vehicle such as an automobile.

[0002]

2. Description of the Related Art Conventionally, such an anti-theft device for on-vehicle audio equipment is normally used even if power is applied to the removed audio equipment after the audio equipment is removed from the vehicle interior. There has already been devised a device of a system that indirectly prevents theft by an anti-theft function that prevents an unnecessary operation.

In such an anti-theft device, when a microcomputer that controls the entire audio equipment detects that power supply from the battery to the audio equipment is cut off, it detects that the audio equipment has been removed from the vehicle. The anti-theft function is activated in response to turning on the power to the audio equipment.

In order to release the thus activated anti-theft function, a character code string input by a keyboard (hereinafter simply referred to as a secret code) is required to match a character code string of several digits (hereinafter simply referred to as a password code) stored in advance. (Hereinafter, simply referred to as an input code), and when the input code matches the password, the anti-theft function can be released.

Further, in order to make it difficult for the thief to release the anti-theft function, if an input error (erroneous input) is detected more than a predetermined number of times without matching the input code and the password, the timer is activated. The timer is started, and the input code cannot be input from the keyboard for a predetermined time set in advance by the timer.

[0006]

However, the above-mentioned conventional anti-theft device for on-vehicle audio equipment automatically detects an input error caused by an input code for releasing the anti-theft function continuously for a predetermined number of times or more. In addition, a timer for a predetermined time set in advance starts counting time, but after a predetermined time by this timer elapses, it becomes possible to input an input code again with the keyboard, so that as a thief, to some extent, If it takes time, there is a problem that the password and the input code finally match, and the anti-theft function is released.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an antitheft device for an on-vehicle audio device in which it is extremely difficult to release the antitheft function by a thief. .

[0008]

According to a first aspect of the present invention, there is provided an anti-theft device for an on-vehicle audio device according to the present invention, comprising: a security code storage means for storing a security code being set; Code input means for inputting a code, code comparing means for comparing the input code and the password at the time of turning on the power to the on-vehicle audio equipment, and releasing the anti-theft mode when the input code and the password match. And a control means for detecting the theft of an in-vehicle audio device, wherein when the code comparison means detects a mismatch between the input code and the password, the number of times of the mismatch is counted as an erroneous input count value. Erroneous input counting means for storing the count value, and whether or not the erroneous input count value by the erroneous input counting means is equal to or greater than a predetermined count value First determining means for determining whether a predetermined input by a predetermined operation has been detected, and timer means for measuring a predetermined time. The control means includes: If the erroneous input count value by the erroneous input count means is equal to or greater than a predetermined count value, a non-permissive mode for prohibiting code input and code comparison by the code input means is set. 2 When a predetermined input is detected by the determination means,
The non-permissible mode being set is released after a predetermined time has elapsed after the timer means starts counting time.

The security code storage means stores a security code preset at a factory or the like when the anti-theft device is shipped, for example, an EEP which is a nonvolatile memory.
It corresponds to a ROM.

The code input means corresponds to, for example, a number key such as a preset key provided in an audio device, and inputs a code number, that is, an input code when power is turned on. If the password is not a number but a character, the code input means inputs the character.

[0011] The code comparing means determines whether or not the password and the input code are the same.

The erroneous input counting means counts the comparison result of the code comparing means, that is, the password and the input code do not match, that is, counts an input error (erroneous input) of the input code, and stores the erroneous input count value. Is what you do.

The first judging means judges whether or not the number of input errors counted by the erroneous input counting means is equal to or greater than a predetermined number stored in advance, that is, a predetermined count value. . The predetermined count value is stored, for example, in an EEPROM or the like.

The second determining means determines whether or not a predetermined input by a predetermined operation has been detected. The predetermined operation is, for example, a key operation used in a tape mode or a tuner mode. It is desirable that this corresponds to a specific key operation that has been set.

The non-permissible mode is, for example, a mode in which the input of an input code by the code input means and the code comparison operation by the code comparison means are prohibited.

The predetermined time by the timer means corresponds to a certain time, for example, one hour, and the non-permissive mode is released after the elapse of the predetermined time.

Therefore, according to the anti-theft device for on-vehicle audio equipment according to the first aspect of the present invention, only when the input error exceeds a predetermined number of times and a predetermined input of the predetermined operation is received, the predetermined time by the timer means is obtained. , The person who does not know the key operation of the predetermined operation cannot input a new input code, and it is extremely difficult to release the anti-theft function.

According to a second aspect of the present invention, in addition to the configuration described in the first aspect, the control means may further comprise the control means for controlling the erroneous input count when a predetermined time elapses by the timer means. The erroneous input count value stored in the means is reduced.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the control unit may further include a counter for counting the erroneous input when a predetermined time has elapsed by the timer unit. The erroneous input count value stored in the means is reduced by "1".

Therefore, according to the anti-theft device for in-vehicle audio equipment of the second and third aspects, in addition to the effect of the first aspect, even if the key operation of the predetermined operation can be decoded, an erroneous input is performed. Since the erroneous input count value stored in the counting means is not cleared, that is, the erroneous input count value currently stored is reduced by a predetermined value, instead of being set to "0", a new input code is re-input next. The chances of being able to do so are reduced, and the possibility that an unauthorized user will decode the correct input code is greatly reduced.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the anti-theft device for on-vehicle audio equipment has a display unit for displaying data, and the control unit is configured to control the non-permissible mode. The first display is displayed on the display means while the second display is displayed on the display means during timer counting in the non-permissible mode.

It should be noted that the first display is a display indicating that the mode is in the non-permission mode, and the second display is a display indicating that the timer is in the non-permission mode and the timer is being started.

Therefore, according to the anti-theft device for on-vehicle audio equipment according to the fourth aspect, in addition to the effect according to the first aspect, if the correct user is erroneously erroneously input more than a predetermined number of times. When a predetermined operation is performed later, the display means displays a message indicating that the timer is running, so that the correct user recognizes that the timer means has been operated by the display indicating that the timer is running, so that the timer has really started. Anxiety about whether or not it is possible can be eliminated.

According to a fifth aspect of the present invention, in addition to the configuration of the first aspect, the predetermined operation is a special operation other than a normal operation. .

The special operation is executed, for example, by double-pressing a specific key or by long-pressing the specific key for two seconds.

Therefore, according to the anti-theft device for an in-vehicle audio device according to the fifth aspect, in addition to the effect according to the first aspect, the predetermined operation is a special operation, so that accidentalness is extremely low. Therefore, the predetermined operation cannot be decrypted, and it is extremely difficult to further release the anti-theft function.

[0027]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an anti-theft device for a vehicle-mounted audio device according to an embodiment of the present invention; FIG. 1 is a block diagram showing a schematic configuration inside a vehicle-mounted audio device provided with the anti-theft device according to the present embodiment.

In FIG. 1, the vehicle-mounted acoustic device according to the present embodiment includes an anti-theft device. The receiving antenna 11 receives a radio broadcast wave arriving in a radio mode. Receiving circuit 12 for demodulating the received radio broadcast radio wave, a tape reproducing circuit 13 for reproducing the tape in the tape mode, and a switching selecting circuit for switching and selecting one of the receiving circuit 12 and the tape reproducing circuit 13. 14, an electronic volume 15 for adjusting the volume of the audio signal switched and selected by the switching selection circuit 14, a preamplifier 16 for amplifying the volume-adjusted audio signal and outputting the audio via a speaker (not shown). Power supply line 17 receiving power supply from a backup power supply
A power supply line 18 for receiving power supply from the battery power supply, a power switch 19 for turning on / off the power supply from the battery power supply, and EEP as a security code storage means for storing a security code to be described later.
A ROM 20, a timer 21 as timer means for measuring time, an operation key 22 for inputting various commands to the on-vehicle audio device, a display 23 as display means for displaying and outputting various data; A microcomputer 24 that controls the entire audio device for use, and various data are rewritably stored in the microcomputer 24. For example, when comparing a personal identification code stored in an EEPROM 20 with an input code, the data is temporarily stored. R used to store information
AM 24a.

The function of the anti-theft device is, as described above, after the on-vehicle audio equipment is removed from the vehicle interior.
Even if the power supply to the removed on-vehicle acoustic device is turned on, the on-vehicle acoustic device does not operate normally.

The EEPROM 20 is a non-volatile memory in which, for example, a four-digit password is stored before shipment.

The operation keys 22 are set to a normal mode such as a tape mode or a radio mode, and command keys relating to the normal mode and code input keys as code input means 1 to 6 are provided. An input code is input with these code input keys. These code input keys are used to input a 4-digit input code only when the backup power supply is started via the backup power supply line 17 and the power switch 19 is turned on to turn on the power supply from the battery power supply. Becomes possible.

The timer 21 starts counting a predetermined time, for example, one hour, when the erroneous input of the input code by the code input key reaches a predetermined number or more.

The microcomputer 24 compares the input code entered by the code input key with the password stored in the EEPROM 20, and releases the anti-theft function when the comparison result matches. If the comparison results do not match, the input error is counted as an erroneous input count value without releasing the anti-theft function, and the erroneous input count value is set to the R value.
This is temporarily stored in the AM 24a. The code comparing means, the control means, the first judging means and the second judging means correspond to the microcomputer 24, and the erroneous input counting means corresponds to the microcomputer 24 and the EEPROM.
20.

Further, the microcomputer 24 detects whether or not the erroneous input count value of the input error has become a predetermined number of times or more, that is, a predetermined count value or more. It detects whether or not a special operation has been input, and when the special operation has been performed, starts counting a predetermined time of the timer 21. When the erroneous input count value is equal to or greater than the predetermined count value, the microcomputer 24 enters a non-permissible mode in which code input and code comparison are not performed until a special operation is performed.

As a special operation using the operation keys 22, it is desirable that one of the keys used in the normal mode also has the same function. For example, the normal operation (short press) of the tape mode fast-forward key or the like is desirable. good. However, since the code input keys 1 to 6 and the power switch 19 described above may be accidentally input in order to prevent theft, it is needless to say that it is desirable to exclude the setting of these keys.

Next, the operation of the on-vehicle audio equipment according to the present embodiment will be described. FIG. 2 is a flowchart showing a processing operation of the microcomputer 24 related to the antitheft function release processing of the in-vehicle audio device according to the present embodiment.

When setting the anti-theft function, the microcomputer 24 forcibly fixes the volume value of the electronic volume 15 to "0" level when the backup is started and the power switch 19 is turned on. By sending a mute control signal to the preamplifier 20, the anti-theft function is set.

The anti-theft function release process shown in FIG. 2 is a process for releasing the anti-theft function being set.

In FIG. 2, the microcomputer 24 has an EEPRO
It is determined whether or not the erroneous input count value of M20 is “3” as a predetermined count value (step S11). E
If the erroneous input count value of the EPROM 20 is not “3”, a code erroneous input display “−−−−−” notifying the user of a code erroneous input is displayed on the display 23 (step S12), and then the operation keys 22 are displayed. It is determined whether a special operation has been performed (step S13).

If a special operation has been performed by the operation key 22, a code input wait display "CODE I" for notifying the user of an input wait by the code input key.
N "is displayed on the display 23 (step S14), and the input code input by the code input key and the EE are displayed.
It is determined whether or not the password matches the password stored in the PROM 20 (step S15).

If the input code and the password match, the erroneous input count value of the EEPROM 20 is set to "0".
(Step S16), the anti-theft function is released (step S17), and this processing operation is terminated. When the anti-theft function is released in step S17, the volume level of the electronic volume 15 and the volume key can be changed according to the operation of the volume key.

If the input code does not match the password at step S15, an erroneous input is detected and the EEP code is detected.
The erroneous input count value of the ROM 20 is incremented by +1 (step S18), and the process proceeds to step S11.

If a special operation has not been performed by the operation keys 22 in step S13, the process proceeds to step S13. That is, in step S13, the timer 21 does not start counting the predetermined time unless a special operation is performed.

In step S11, the EEPROM 2
If the erroneous input count value of 0 is “3”, the display 2
3 displays an incorrect code input display "---" (step S19), and determines whether or not a special operation has been performed using the operation keys 22 (step S20).

If a special operation has been performed by the operation key 22, a timer start display “=” is displayed on the display 25.
=== ”is displayed (step S21), and the timer 2
1 is started (step S2).
2) It is determined whether or not a predetermined time, for example, one hour, has elapsed by the timer 21 (step S23).

If the predetermined time by the timer 21 has elapsed, the erroneous input count value of the EEPROM 20 is reduced by "1", the erroneous input count value is set to "2" (step S24), and the routine proceeds to step S14. still,
The processing operation of step S24 limits the input of a new input code by a thief after a predetermined time has elapsed.

Therefore, according to the present embodiment, the timer is set only when the erroneous input (input error) of the input code exceeds a predetermined number of times, that is, two times, and the special operation by the operation key 22 is performed. Since the predetermined time counting by the user 21 is started, a user such as a thief who does not know the execution of the special operation cannot input a new input code, and it is extremely difficult to release the anti-theft function. .

Further, according to the present embodiment, even if the special operation can be decoded, the erroneous input count value currently stored in the EEPROM 20 is not set to "0".
Since the erroneous input count value is reduced from "3" to "2", there is less chance of re-inputting to match the input code next time, and an unauthorized user may decode the correct input code. Is extremely small.

Also, according to the present embodiment, if a correct user incorrectly inputs an input code three or more times,
When a special operation is performed, a display indicating that the timer 21 is running is displayed on the display 23. Therefore, the correct user recognizes that the timer 21 has been operated, and thus has an uneasy feeling whether or not the timer 21 has actually been started. Can be eliminated.

In the above embodiment, the special operation is executed by a specific normal key input (short press). However, for example, a specific normal key is double-pressed or a specific normal key is pressed. It may be executed by pressing the key for a long time, for example, by continuously pressing the key for 2 seconds. In this case, since the chance is very low, it is more difficult to release the anti-theft function.

[0051]

According to the anti-theft device for an on-vehicle audio device according to the first aspect of the present invention configured as described above, when an input error exceeds a predetermined number of times and a predetermined input of a predetermined operation is received. As long as the timer means starts counting the predetermined time, a person who does not know the key operation of the predetermined operation cannot input a new input code, and it is extremely difficult to release the anti-theft function. Become.

According to the anti-theft device for on-vehicle audio equipment according to the second and third aspects, in addition to the effect of the first aspect, even if the key operation of the predetermined operation can be decoded, erroneous input is performed. Since the erroneous input count value stored in the counting means is not cleared, that is, is not set to “0”, the erroneous input count value currently stored is reduced by a predetermined value.
Next, the chance of re-inputting a new input code is reduced, and the possibility that an unauthorized user will decode the correct input code is greatly reduced.

According to the anti-theft device for on-vehicle audio equipment according to the fourth aspect, in addition to the effect of the first aspect, in addition to the effect according to the first aspect, a correct operation can be performed after a correct user erroneously reaches a predetermined number of input errors. Is performed, the display means displays a display indicating that the timer is running, so that the correct user recognizes that the timer means has been operated by the display indicating that the timer is running, and determines whether the timer has actually started. Feeling of anxiety can be eliminated.

According to the anti-theft device for on-vehicle audio equipment of the fifth aspect, in addition to the effect of the first aspect, the predetermined operation is a special operation, so that accidentalness is extremely low. The predetermined operation cannot be decoded, and it is extremely difficult to further release the anti-theft function.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration inside a vehicle-mounted audio device including an anti-theft device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a processing operation of a microcomputer in the anti-theft function release processing according to the embodiment.

[Explanation of symbols]

Reference Signs List 20 EEPROM (security code storage means, wrong input count means) 21 Timer (timer means) 22 Operation keys (code input key; code input means) 23 Display (display means) 24 Microcomputer (control means, code comparison means, wrong input) Counting means, first determining means, second determining means) 24a RAM

Claims (5)

[Claims] 1. A security code storage means for storing a security code being set, a code input means for inputting an input code, and a code comparison for comparing the input code and the security code when power is supplied to a vehicle-mounted audio device. And a control means for canceling the anti-theft mode when the input code and the security code match, wherein the code comparison means does not match the input code and the security code at the code comparison means. Is detected, the number of mismatches is counted as an erroneous input count value, and erroneous input count means for storing the erroneous input count value; and whether the erroneous input count value by the erroneous input count means is equal to or greater than a predetermined count value. First determining means for determining whether or not a predetermined input by a predetermined operation has been detected; and And a timer means for counting time. The control means, if the erroneous input count value by the erroneous input count means is equal to or more than a predetermined count value in the first determination means, code input by the code input means and code comparison Is set in the non-permissive mode, and when a predetermined input is detected by the second determining means during the setting of the non-permissible mode, the timer starts counting time, and the non-permissive mode being set is set after a predetermined time has elapsed. An anti-theft device for in-vehicle audio equipment, which is released. 2. The in-vehicle audio device according to claim 1, wherein said control means decreases the erroneous input count value stored in said erroneous input counting means when a predetermined time has elapsed by said timer means. Anti-theft device. 3. The control unit according to claim 1, wherein, when a predetermined time elapses by the timer unit, the erroneous input count value stored in the erroneous input count unit is decreased by “1”. Anti-theft device for in-vehicle audio equipment. 4. A display means for displaying data, wherein the control means causes the display means to display a first display during the non-permissive mode, and displays a first display during the non-permissible mode. The anti-theft device for in-vehicle audio equipment according to claim 1, wherein a second display is displayed on the display means. 5. The anti-theft device for an in-vehicle audio device according to claim 1, wherein the predetermined operation is a special operation other than a normal operation.