KR102084408B1 - Apparatus and method for preventing unauthorized modification of head unit using LCD temperature data - Google Patents

Abstract

The present invention relates to a device for preventing an unauthorized modification of a head unit using liquid crystal display (LCD) temperature data and a method thereof, which can determine whether an unauthorized modification is performed at a head unit of a stereo system or a navigation device for a vehicle by using temperature data of an LCD, and, when it is determined that the unauthorized modification is performed, automatically locks all functions to prevent use. To this end, the device for preventing an unauthorized modification of a head unit using LCD temperature data comprises: an LCD which detects temperature data by using a temperature sensor when power is supplied, and transmits the detected temperature data at a predetermined cycle; a main control unit (MCU) which transmits and receives image data and the temperature data through data communication with the LCD, calculates an LCD temperature value and an RTC temperature value which is acquired by an RTC temperature sensor, compares the temperature as the calculation result to a predetermined reference temperature before determining whether the unauthorized modification is performed based on the comparison result, displays a message regarding the unauthorized modification on the LCD in a pop-up manner, and locks all functions of a head unit; and a voice control unit which mutes voice when the functions are locked.

Description

Apparatus and method for preventing unauthorized modification of head unit using LCD temperature data}

The present invention relates to an apparatus and method for preventing unauthorized modification of a head unit using LCD temperature data, in particular, determining whether unauthorized modification is performed using temperature data of the LCD in a head unit of a vehicle audio or navigation device, and unauthorized When it is judged to be a modification, it relates to an apparatus and method for preventing unauthorized modification of the head unit using LCD temperature data that is automatically locked so that all functions cannot be used.

Various audio systems (eg, car audio systems, audio / video / navigation systems, navigation systems, etc.) are installed in the vehicle. While driving a vehicle, the driver utilizes various functions (especially route guidance, radio listening, etc.) using the audio system.

Most of the drivers using the expensive head unit often use the same as the desired function in the head unit, but the driver using the low cost head unit often wants to modify it without permission to implement the high function at low cost. have.

In the form of unauthorized modification of the low-cost head unit, the audio path circuit uses the circuit of the genuine head-unit as it is, and the operation unit and the screen unit are mostly equipped with commercially available devices.

In this case, there is a high possibility of a problem of circuit matching or quality, and if a problem occurs in the head unit after unauthorized modification, customers often recover the head unit and apply for A / S. When the remodeled head unit is restored and applied for after-sales service, it is not easy to check it in the service center.

Therefore, vehicle manufacturers are demanding methods to prevent unauthorized modification of the head unit or to easily check it when unauthorized modification is made.

On the other hand, the following <Patent Document 1> to <Patent Document 4> discloses a technique for preventing theft of an audio device mounted on an existing vehicle.

In the prior art disclosed in <Patent Document 1>, an insertion port for inserting an MP3 player is formed on one side of the front surface of the head unit, and a connection terminal electrically connected to the MP3 player is formed inside the insertion port so that the MP3 player is connected from the connection terminal. By allowing the security device in the head unit to operate when it is dropped, the MP3 player can be used as a security switch for car audio, so it can be used more universally, and when an MP3 player is connected to the head unit, the audio sound of the MP3 player can be played. It can be heard through the speaker to prevent car audio theft.

In addition, the prior art disclosed in <Patent Document 2> is installed in the space between the front panel and the dashboard of the car audio of the vehicle, the horn is connected to the push switch and the push switch in an off state, and the other end is connected to the horn. A wire is provided, and the push switch is turned on due to the enlargement of the space when the car audio is removed, thereby operating the horn by a wire connected to the horn. Through this configuration, when the car audio is removed for the purpose of illegally deodorizing the car audio, a switch attached thereto operates to operate the horn connected to the switch to prevent theft of the car audio.

In addition, the prior art disclosed in <Patent Document 3> is a user input method from the producer input method, and the user can delete the existing password at will, or enter a new password again to change the password of the car-audio. Related to this, it is possible to distinguish between the original function of the button and the function of entering the password according to the pressing time difference by using any button, and the selection mode and the existing mode to randomly select whether to use the password when operating the password input mode and set It is possible to delete or change the existing password by using the deletion mode that can delete the password of the user, thereby providing convenience in using the car-audio using the password.

In addition, in the prior art disclosed in <Patent Document 4>, in order to prevent theft of the front detachable car audio, a password is stored in a specific address of IPROM, and a certain data value is written in any one of the address description areas to mask it. . The masked address cannot be artificially deleted, so when Car Audio's micom reads the password from IPROM, it first erases all the masked address entry area and then reads the masked address area again to read the password and read the password. Make car audio unusable after theft. Accordingly, even if a person who is not the primary user of the car audio has stolen the car audio or attempts to operate it without permission, the car audio cannot be used to prevent the car audio from being stolen.

Republic of Korea Registered Utility Model 20-0360851 (Registration on August 25, 2004) (Car audio anti-theft device) Republic of Korea Public Room 1999-0030712 (Car audio anti-theft alarm operation device) Republic of Korea Patent Publication No. 1994-0022445 (released on October 20, 1994) (car-audio password input method) Republic of Korea Patent Publication No. 1996-0040857 (published on December 17, 1996) (security method using IPROM of car audio set)

However, the general vehicle audio system and the prior art as described above are technical contents for preventing the theft of the head unit (audio device, navigation device generically), and the audio path circuit uses the circuit of the genuine head unit as it is, and the control unit and screen It has the disadvantage that it is impossible to prevent this if it is converted into a commercial product.

In particular, the method of using a Bluetooth module (BT Module) or MAC address (MAC Address) is also a technology for preventing theft, and has a disadvantage of not being able to prevent modification of the head unit by default.

Therefore, the present invention has been proposed to solve various problems occurring in the prior art as described above, and the presence or absence of unauthorized modification is determined by using the temperature data of the LCD in the head unit of the vehicle audio or navigation device, and it is judged as unauthorized modification. The object is to provide an apparatus and method for preventing unauthorized modification of the head unit using LCD temperature data that is automatically locked when all functions are disabled.

In order to achieve the above object, the apparatus for preventing unauthorized modification of the head unit using the LCD temperature data according to the present invention detects temperature data using a temperature sensor when power is supplied, and schedules the detected temperature data. A liquid crystal display (LCD) transmitting at periodic intervals; Transmits and receives image data and temperature data through data communication with the LCD, calculates the LCD temperature value and the RTC temperature value obtained by the RTC temperature sensor, compares the calculated result temperature with a preset reference temperature, depending on the size. A main control unit (MCU) for determining unauthorized modification, displaying a message about unauthorized modification in a pop-up form on the liquid crystal display, and locking all functions of the head unit; And a voice control unit that mutes the voice when the function is locked according to the control of the main control unit.

The liquid crystal display in the above is a temperature sensor for detecting the LCD temperature; And a data interface unit that periodically transmits the temperature data detected by the temperature sensor to the main control unit,

In the emergency mode, the data interface unit receives a message corresponding to unauthorized modification transmitted from the main control unit and transmits the message to the display unit.

In the above, the main control unit performs data communication with the liquid crystal display to transmit display data to the liquid crystal display, and a data receiving unit to receive LCD temperature data transmitted from the liquid crystal display and RTC temperature data transmitted from an RTC temperature sensor; Subtract the LCD temperature value from the RTC temperature value, compare the subtraction result temperature value with a preset reference temperature, determine the error when the subtraction result temperature value is above the reference temperature, count the error, and calculate the error count value. When the setting value is exceeded, the mode control unit judges unauthorized modification and automatically switches to the emergency mode to control the display of pop-up messages for unauthorized modification, control audio mute, and ignore key input; It characterized in that it comprises a release command processing unit for releasing control of the emergency mode when the mode is changed to the engineering mode by the mode control unit is switched to the engineering mode and the unlocking code is input.

In order to achieve the above object, the method for preventing unauthorized modification of the head unit using the LCD temperature data according to the present invention is a method for preventing unauthorized modification of the head unit using the LCD temperature data, (a) the head Checking the status of the liquid crystal display and the RTC when driving power is supplied from the main control unit in the unit, and entering an error diagnosis mode if the status is abnormal; (b) if the liquid crystal display and the RTC in the main control unit are in a normal state, obtaining temperature data of the LCD and RTC; (c) determining whether there is an error using the temperature difference information of the LCD and the RTC obtained from the main control unit and a reference set temperature, and increasing the error count when it is determined to be an error; (d) If the error count value is greater than or equal to the set value as a result of the counting in the step (c), determining the unauthorized modification and automatically switching to the emergency mode.

The step (d) is characterized in that when switching to the emergency mode, the pop-up message for unauthorized modification is transmitted to the liquid crystal display to control the display, the audio mute is controlled, and all key inputs are ignored.

The step (c) is characterized by subtracting the LCD temperature value from the RTC temperature value, comparing the subtraction result temperature value with a preset reference temperature, and determining that an error occurs when the subtraction result temperature value is higher than the reference temperature. To prevent unauthorized modification of the head unit using the LCD temperature data.

According to the present invention, the presence or absence of unauthorized modification is determined by using the temperature data of the LCD in the head unit of the vehicle audio or navigation device, and if it is determined as unauthorized modification, all functions are automatically locked so that they cannot be used, thereby allowing unauthorized modification. It has the effect of preventing the unauthorized use of the original head by disabling the use of the city head unit.

1 is a block diagram of an apparatus for preventing unauthorized modification of a head unit using LCD temperature data according to the present invention;
Figure 2 is an exemplary view of the pop-up screen in the unauthorized modification state and unauthorized modification of the head unit in the present invention,
3 is a flow chart showing a method for preventing unauthorized modification of the head unit using LCD temperature data according to the present invention.

Hereinafter, an apparatus and method for preventing unauthorized modification of the head unit using LCD temperature data according to the present invention according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a device for preventing unauthorized modification of a head unit using LCD temperature data according to a preferred embodiment of the present invention, a liquid crystal display 110, a main control unit 120, a voice control unit 130, an operation unit ( 140) and the RTC temperature sensor 150 to implement the head unit.

When the power supply (ACC ON) is performed, the liquid crystal display 110 serves to detect temperature data using the temperature sensor 111 and transmit the detected temperature value at regular intervals.

The liquid crystal display 110 includes a temperature sensor 111 that detects LCD temperature, and a data interface unit 112 that periodically transmits temperature data detected by the temperature sensor 111 to the main control unit (MCU) 120. ), The data interface unit 112 receives a message corresponding to unauthorized modification transmitted from the main control unit 120 in an emergency mode, and transmits the message to the display unit. Here, although the display unit is not illustrated in the drawings, it is basically provided in the liquid crystal display, and serves to display the received image data on the screen.

In addition, the RTC temperature sensor 150 serves to detect the temperature of the RTC and transmit it to the main control unit 120.

The main control unit 120 transmits and receives image data and temperature data through data communication with the liquid crystal display 110, calculates the LCD temperature value and the RTC temperature value obtained with the RTC temperature sensor, and calculates the temperature and the temperature in advance. By comparing the set reference temperature, it is judged as unauthorized modification according to the size of the case, and a message for unauthorized modification is displayed on the liquid crystal display in a pop-up form, and serves to lock all functions of the head unit.

The main control unit 120 performs data communication with the liquid crystal display 110 to transmit display data to the liquid crystal display 110 and a data receiving unit to receive LCD temperature data transmitted from the liquid crystal display 110. (121), subtracting the LCD temperature value from the RTC temperature value, and comparing the subtraction result temperature value with a preset reference temperature, and if the subtraction result temperature value is higher than the reference temperature, it is determined as an error, and an error count is calculated. If the error count value exceeds the set value, it is judged as unauthorized modification, and it automatically switches to emergency mode to control the pop-up message display for unauthorized modification, control audio mute, and ignore key input. The mode control unit 122, the mode control unit 122 is switched to the emergency mode in the state of switching to the engineering mode (Engineering Mode) and unlocking code When the input includes a cancel command processing unit 123 to disable the control of the emergency mode.

The voice control unit 130 serves to mute all voices when the function is locked under the control of the main control unit 120, and the operation unit 140 includes a plurality of function buttons and inputs functions to the head unit Plays a role.

The operation of the apparatus for preventing unauthorized modification of the head unit using the LCD temperature data according to the present invention configured as described above will be described in detail as follows.

First, when the power is supplied (ACC ON), the liquid crystal display 110 detects the temperature using the temperature sensor 111, and the main control unit (at a predetermined cycle) through the data interface unit 112 for the detected temperature value. 120).

Here, only the interface of the image data is made between the liquid crystal display 110 and the main control unit 120, but it is assumed that a separate LCD temperature data interface function is added to implement the present invention.

In addition, when the power is supplied (ACC ON) to the RTC temperature sensor 150, the RTC temperature is detected and the detected temperature value is transmitted to the main control unit 120 at regular intervals.

When power is supplied, the main control unit 120 receives the LCD temperature value and the RTC temperature value from the liquid crystal display 110 and the RTC temperature sensor 150 at regular intervals from the data receiving unit 121.

Then, the received temperature values are transmitted to the mode control unit 122.

The mode control unit 122 calculates the LCD temperature value and the RTC temperature value obtained through the data receiving unit 121 (RTC temperature value-LCD temperature value), and is set in advance to determine the temperature and error of the calculation result. By comparing the reference temperature (20 ° C), if the calculation result temperature is less than the reference temperature, it is determined as a normal state, and the normal mode is maintained. In the normal mode, the entire operation of the head unit is controlled in response to a function input through the operation unit 140. In addition, the navigation route guidance voice or the audio voice generated by listening to the audio is transmitted through the voice control unit 130 to the speaker mounted on the vehicle.

 Unlike this, if the temperature of the calculation result is greater than the reference temperature, it is determined as an error state and the error count is increased.

Then, if the error count value exceeds the reference count value by comparing the increased error count value with a preset reference count value (for example, 20) to determine unauthorized modification, if the error count value exceeds the reference count value, the operation unit and the screen of the head unit It is determined that unauthorized modification is made, and a message for unauthorized modification is generated and transmitted to the liquid crystal display 110 through the data receiving unit 121. The liquid crystal display 110 displays a message about unauthorized modification on the screen in a pop-up form.

For example, FIG. 2 (a) is a state in which only the operation unit and the front unit of the head unit are removed, and (b) is a screen maintaining the genuine audio path. In addition, (c) is a head unit screen in which the audio path is maintained as it is, and only the control panel and the front panel are mounted with other commercial products. If it is judged as unauthorized modification, as shown in (d), a message about unauthorized modification is displayed in a pop-up form. Therefore, the driver (user) can also recognize this through the screen of the liquid crystal display 110 after unauthorized modification.

In addition, the mode control unit 122 automatically switches to an emergency mode when it is determined as unauthorized modification as described above to lock all functions. For example, in the state of switching to the emergency mode, the audio mute is controlled through the voice control unit 130 and the key input input through the operation unit 140 is ignored. Here, ignoring the key input disables hardware key input as well as software key operation. Here, only the power-off function key can be operated, so that the power can be turned off.

Accordingly, the head unit itself cannot be used during unauthorized modification, thereby preventing the user from remodeling the head unit.

On the other hand, when the release command processing unit 123 later switches to the engineering mode in the state of being switched to the emergency mode for A / S and the unlocking code is input, the control of the emergency mode is released to release the A / S To be able to perform.

3 is a flow chart showing a method for preventing unauthorized modification of the head unit using LCD temperature data according to the present invention. (A) When driving power is supplied from the main control unit 120 in the head unit, the liquid crystal display 110 and the RTC Checking the state to enter the fault diagnosis mode if the state is abnormal (S101-S107), (b) If the liquid crystal display 110 and the RTC in the main control unit 120 is normal, the temperature data of the LCD and RTC Acquiring steps (S108-S110), (c) determining whether there is an error using the temperature difference information and the reference set temperature of the obtained LCD and RTC in the main control unit 120, and if it is determined as an error, an error count is calculated. Step of increasing (S111-S113), (d) If the count result of step (c), the error count value is greater than or equal to the set value, it is determined as unauthorized modification, and automatically switches to the emergency mode (S114-S115) ).

The method for preventing unauthorized modification of the head unit using the LCD temperature data according to the present invention configured as described above will be described in detail as follows.

First, when power is supplied (ACC ON) as in step S101, LCD initialization is performed in step S102. Subsequently, if it is determined in step S103 that the LCD is a failure, the flow advances to step S104 to enter the LCD failure diagnosis mode.

Otherwise, if the LCD is judged to be in a normal state, the process moves to step S105 to initialize the RTC, and then moves to step S106 to check the state of the RTC. If it is determined as a result of the check, it moves to step S107 to enter the RTC fault diagnosis mode.

In addition, if the RTC is also in a normal state, the process goes to step S108 to enter the normal operation mode.

In the normal mode, as shown in steps S109 and S110, the temperature value of the liquid crystal display 110 and the temperature value of the RTC are respectively obtained.

Subsequently, in step S111, the LCD temperature value is subtracted from the RTC temperature value (| RTC-LCD |), the subtraction result temperature value is compared with a preset reference temperature (for example, 20 ° C), and the subtraction result temperature If the value is smaller than the reference temperature, it is determined as normal, and the flow goes to step S112 to initialize the count value.

On the other hand, if the temperature value of the subtraction result is greater than the reference temperature, the process moves to step S113 to determine an error, and increases the error count value by one.

Thereafter, when the error count value increased by moving to step S114 is compared with a reference count value (for example, 20) set to determine unauthorized modification, if the error count value is smaller than the reference count value, an error detection process is performed. Perform.

Unlike this, if the error count value is greater than or equal to the reference count value, it is determined as unauthorized modification, and the process goes to step S115 to automatically switch to the emergency mode to lock all functions. For example, in a state in which the emergency mode is switched, the audio mute is controlled through the voice control unit 130 and the key input input through the operation unit 140 is ignored. Here, ignoring the key input disables hardware key input as well as software key operation. Here, only the power-off function key can be operated, so that the power can be turned off.

In this way, the head unit itself cannot be used for unauthorized modification, thereby preventing the user from remodeling the head unit.

On the other hand, when the release command processing unit 123 later switches to the engineering mode in the state of being switched to the emergency mode for A / S and the unlocking code is input, the control of the emergency mode is released to release the A / S To be able to perform.

Although the invention made by the present inventors has been described in detail according to the above embodiments, the present invention is not limited to the above embodiments and can be changed in various ways without departing from the gist thereof. It is obvious to those who have it.

110: liquid crystal display (LCD) 111: temperature sensor
112: data interface unit 120: main control unit (MCU)
121: data receiving unit 122: mode control unit
123: release command processing unit 130: voice control unit
140: control unit 150: RTC temperature sensor

Claims (6)

As a device for preventing unauthorized modification of the head unit using LCD temperature data,
A liquid crystal display (LCD) that detects temperature data using a temperature sensor and transmits the detected temperature data at regular intervals when power is supplied (ACC ON);
Transmits and receives image data and temperature data through data communication with the LCD, calculates the LCD temperature value and the RTC temperature value obtained by the RTC temperature sensor, compares the calculated result temperature with a preset reference temperature, depending on the size. A main control unit (MCU) for determining unauthorized modification, displaying a message about unauthorized modification in a pop-up form on the liquid crystal display, and locking all functions of the head unit; And
An apparatus for preventing unauthorized modification of the head unit using LCD temperature data, characterized in that it comprises a voice control unit that mutes the voice when the function is locked according to the control of the main control unit.
The method according to claim 1, The liquid crystal display is a temperature sensor for detecting the LCD temperature; And a data interface unit that periodically transmits the temperature data detected by the temperature sensor to the main control unit,
In the emergency mode, the data interface unit receives a message corresponding to unauthorized modification transmitted from the main control unit and transmits the message to the display unit, thereby preventing unauthorized modification of the head unit using LCD temperature data.
The method according to claim 1, wherein the main control unit performs data communication with the liquid crystal display to transmit display data to the liquid crystal display, and receives the LCD temperature data transmitted from the liquid crystal display and the RTC temperature data transmitted from the RTC temperature sensor. A data receiver; Subtract the LCD temperature value from the RTC temperature value, compare the subtraction result temperature value with a preset reference temperature, determine the error when the subtraction result temperature value is above the reference temperature, count the error, and calculate the error count value. When the setting value is exceeded, the mode control unit judges unauthorized modification and automatically switches to the emergency mode to control the display of pop-up messages for unauthorized modification, control audio mute, and ignore key input; And a release command processing unit for releasing the control of the emergency mode when the mode is switched to the engineering mode by the mode control unit and the unlocking code is input. Modification prevention device.
As a method for preventing unauthorized modification of the head unit using LCD temperature data,
(a) when driving power is supplied from the main control unit in the head unit, checking the status of the liquid crystal display and the RTC to enter a failure diagnosis mode if abnormal;
(b) if the liquid crystal display and the RTC in the main control unit are in a normal state, obtaining temperature data of the LCD and RTC;
(c) determining whether there is an error using the temperature difference information of the LCD and the RTC obtained from the main control unit and a reference set temperature, and increasing the error count when it is determined to be an error;
(d) When the count result of step (c), the error count value is greater than or equal to the set value, determining by unauthorized modification, and automatically switching to the emergency mode. How to prevent unauthorized modification of the unit.
In claim 4, the step (d) is characterized in that the control to display on the screen by transmitting a pop-up message for unauthorized modification to the LCD display when switching to the emergency mode, control the audio mute, and ignore all key input Method for preventing unauthorized modification of head unit using LCD temperature data.
In claim 4, step (c) subtracts the LCD temperature value from the RTC temperature value, compares the subtraction result temperature value with a preset reference temperature, and determines that it is an error when the subtraction result temperature value is higher than the reference temperature. Method for preventing unauthorized modification of the head unit using the LCD temperature data, characterized in that.

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