JP2007237798A - Information recording device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit the rewriting of data of a device recorded with vehicle information after the collision of a vehicle. <P>SOLUTION: Specific information for each vehicle is previously recorded in an EEPROM12 of an information recording device (EDR) 1. When the vehicle specific information is recorded once, the writing of later data is inhibited. A CPU10 performs the authentication of the vehicle specific information recorded in the EEPROM12. When the result of the authentication is OK, the vehicle information to the EEPROM13 is permitted to be recorded, and when the result of the authentication is NG, the vehicle information to the EEPROM13 is inhibited to be recorded. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle information recording apparatus that records various types of vehicle information at the time of a vehicle collision.

  2. Description of the Related Art Conventionally, an apparatus that records various types of vehicle information when a vehicle collides is known (see Patent Document 1).

Japanese Patent Laid-Open No. 10-11694

  However, the conventional apparatus has a problem that data of an apparatus that records vehicle information may be rewritten after a vehicle collision.

  The vehicle information recording apparatus according to the present invention permits the recording of the vehicle information to the second recording means when the authentication of the vehicle specific information recorded in the first recording means is permitted, and authenticates the vehicle specific information. If it is not recognized, the recording of the vehicle information to the second recording means is prohibited, and the vehicle information is recorded if the information recording is permitted when the collision of the vehicle is detected or predicted. It is characterized by doing.

  According to the vehicle information recording apparatus of the present invention, if the authentication of the vehicle specific information is not permitted, the recording of the vehicle information in the second recording means is prohibited, so that unauthorized rewriting of the vehicle information can be prevented. .

  FIG. 1 is a diagram showing an overall configuration of a vehicle information recording apparatus according to an embodiment. An information recording device (EDR) 1 mounted on a vehicle and used includes a vehicle speed sensor 2, a brake switch 3, a throttle opening sensor 4, a seat belt sensor 5, a light switch 6, a direction indication sensor 7, a collision detection sensor 20, And it is connected with the vehicle controller 30.

  The vehicle speed sensor 2 detects the speed of the vehicle. The brake switch 3 outputs a brake ON signal when a brake (not shown) is depressed. The throttle opening sensor 4 detects the opening of a throttle valve (not shown). The seat belt sensor 5 detects whether or not the driver is wearing a seat belt. The light switch 6 detects whether or not a headlight (not shown) is turned on. The direction indicator sensor 7 detects the operating state of the direction indicator. The collision detection sensor 20 detects a vehicle collision.

  The vehicle controller 30 that performs various types of vehicle control transmits vehicle-specific information unique to each vehicle to the information recording device (EDR) 1 after the vehicle is started. This vehicle specific information is the same information as the vehicle specific information recorded in the EEPROM 12 to be described later.

  The information recording device (EDR) 1 includes a CPU 10, EEPROMs 12 and 13 that are nonvolatile memories, and a backup power source 14. CPU10 is provided with RAM11 and performs the process mentioned later based on the signal input from each sensor 2-7,20. Power is supplied to the CPU 10 from a main power source such as a battery (not shown), but when the power supply from the main power source is stopped due to a vehicle collision, power is supplied from the backup power source 14. The backup power source 14 is, for example, an aluminum electrolytic capacitor.

  CPU10 reads vehicle information for every predetermined time, and records it on RAM11. The vehicle information includes the vehicle speed detected by the vehicle speed sensor 2, the brake signal output from the brake switch 3, the throttle opening detected by the throttle opening sensor 4, and the seat belt detection detected by the seat belt sensor 5. The state, the light lighting signal output from the light switch 6, and the direction indicator signal output from the direction indication sensor 7 are included.

  In the EEPROM 12, which is a non-volatile memory, for example, information unique to each vehicle is written in a vehicle production factory. The information unique to each vehicle is, for example, a vehicle body number, and a different number is assigned to each vehicle. Once the vehicle specific information is written in the EEPROM 12, subsequent data writing (overwriting) is prohibited. Therefore, a third party cannot rewrite the vehicle specific information recorded in the EEPROM 12.

  The CPU 10 compares the vehicle specific information recorded in the EEPROM 12 with the vehicle specific information transmitted from the vehicle controller 30 after the vehicle is started. If the two match, the CPU 10 stores the information into the EEPROM 13 which is a nonvolatile memory. Data writing is permitted, and if they do not match, data writing to the EEPROM 13 is prohibited. When a collision of the vehicle is detected by the collision detection sensor 20 in a state where data writing is permitted, the vehicle information temporarily recorded in the RAM 11 is written in the EEPROM 13.

  FIG. 2 is a flowchart showing the contents of processing performed by the vehicle information recording apparatus in the embodiment. When the vehicle is activated, the CPU 10 starts the process of step S10. In step S10, it is determined whether vehicle specific information transmitted from the vehicle controller 30 has been received. If it determines with having received vehicle specific information, it will progress to step S20, and if it determines with not having received, it will progress to step S80. In step S80, data writing to the EEPROM 13 is prohibited.

  In step S20, it is determined whether or not vehicle-specific information is recorded in the EEPROM 12. If it is determined that the vehicle-specific information is not recorded, the EEPROM 12 may not be authorized, so the process proceeds to step S80, and data writing to the EEPROM 13 is prohibited. On the other hand, if it is determined that the vehicle specific information is recorded in the EEPROM 12, the process proceeds to step S30.

  In step S30, the vehicle unique information received from the vehicle controller 30 is compared with the vehicle unique information recorded in the EEPROM 12, and it is determined whether or not they match. If it is determined that they match, the process proceeds to step S40, and if it is determined that they do not match, the process proceeds to step S90.

  In step S90, data writing to the EEPROM 13 is prohibited and the process proceeds to step S100. In step S100, a command is issued to the vehicle controller 30 to disable normal vehicle travel. Upon receiving this command, the vehicle controller 30 performs control to disable normal traveling, for example, by prohibiting fuel injection.

  In step S40 that proceeds after it is determined that the vehicle-specific information matches, data writing to the EEPROM 13 is permitted, and the process proceeds to step S50. In step S50, based on the signal transmitted from the collision detection sensor 20, it is determined whether or not a vehicle collision has occurred. If it is determined that no collision has occurred, the process waits in step S50. If it is determined that a collision has occurred, the process proceeds to step S60.

  In step S60, the vehicle information recorded in RAM 11 is recorded in EEPROM 13, and the process proceeds to step S70. In step S70, it is determined whether or not an airbag (not shown) has been activated. If it is determined that the airbag is activated due to the collision of the vehicle, the process proceeds to step S100, and a command is issued to the vehicle controller 30 to disable normal vehicle travel. On the other hand, if it is determined that the airbag is not activated, the process of the flowchart is terminated.

  According to the vehicle information recording apparatus in the embodiment, in the system that records the vehicle information in the EEPROM 13 at the time of the collision of the vehicle, the vehicle specific information recorded in the EEPROM 12 is authenticated, and the authentication result is positive. If there is, the recording of the vehicle information to the EEPROM 13 is permitted, and if the authentication result is negative, the recording of the vehicle information to the EEPROM 13 is prohibited. If the authentication of the vehicle specific information is not permitted, the recording of the vehicle information in the EEPROM 13 is not permitted, so that unauthorized rewriting of data in the information recording device 1 can be prevented. For example, even if an attempt is made to write vehicle information to the EEPROM 13 using an external device, the vehicle specific information is not received from the vehicle controller 30, so that authentication of the vehicle specific information is not permitted and vehicle information cannot be written. .

  Even when the information recording apparatus 1 itself is replaced, it can be determined whether or not the information recording apparatus 1 has been replaced based on the vehicle specific information recorded in the EEPROM 12.

  According to the vehicle information recording apparatus in the embodiment, when the vehicle is started, the vehicle-specific information recorded in the EEPROM 12 is authenticated, so that the EEPROM 13 is set in the recording permission state before the collision of the vehicle occurs. be able to. Thus, vehicle information can be quickly recorded at the time of a vehicle collision, and power consumption during information recording can be reduced.

  According to the vehicle information recording apparatus in the embodiment, when the vehicle specific information recorded in the EEPROM 12 and the vehicle specific information transmitted from the vehicle controller 30 do not match, the vehicle information is recorded in the EEPROM 13. Is prohibited and normal driving of the vehicle is prohibited. Thereby, traveling of the vehicle in which the information recording apparatus 1 has been exchanged illegally can be prohibited.

  The present invention is not limited to the embodiment described above. For example, the vehicle body number is given as an example of the vehicle unique information recorded in the EEPROM 12, but it may be unique information (data) that is different for each vehicle, such as an ID code used for an immobilizer. Further, in step S10 of FIG. 2, it is determined whether or not the vehicle specific information is received from the vehicle controller 30, but the transmission destination of the vehicle specific information for authenticating the vehicle specific information recorded in the EEPROM 12 is: It is not limited to the vehicle controller 30.

  Although the vehicle specific information has been described as being written in the EEPROM 12 at the factory, it may be automatically written in the EEPROM 12 when the vehicle is started for the first time. That is, when the CPU 10 of the information recording device 1 receives vehicle specific information from the vehicle controller 30 at the time of first vehicle activation, the received vehicle specific information is written in the EEPROM 12. Also in this case, once the vehicle-specific information is written in the EEPROM 12, subsequent data writing is prohibited. According to this method, the process of recording the vehicle specific information in the EEPROM 12 can be omitted in the factory.

  In the above-described embodiment, when the vehicle is started, the vehicle specific information recorded in the EEPROM 12 is authenticated. However, after the collision detection sensor 20 detects a vehicle collision, the vehicle specific information is authenticated. You may do it. However, in the method of authenticating the vehicle specific information after the collision is detected, it takes time until the writing of the vehicle information to the EEPROM 13 starts. Therefore, it is preferable to authenticate the vehicle specific information before detecting the collision.

  The vehicle information recorded in the EEPROM 13 includes the vehicle speed, the accelerator opening, the presence / absence of a brake, the wearing state of a seat belt, the presence / absence of lighting of a headlight, and the operating state of a direction indicator. Alternatively, a combination of two or more may be used. Moreover, vehicle information is not restricted to what was mentioned above, For example, other information, such as the presence or absence of operation of ABS, can also be included. Moreover, although EEPROM was used as a non-volatile memory which records vehicle information at the time of a vehicle collision, you may use another non-volatile memory.

  In step S100 of the flowchart shown in FIG. 2, as an example of control that disables normal traveling, prohibition of fuel injection is mentioned. Any other control may be used as long as the control restricts the normal traveling.

  In the vehicle information recording apparatus according to the embodiment described above, the collision of the vehicle is detected. However, instead of detecting the collision, the collision of the vehicle may be predicted. For example, it is possible to provide a separate imaging device for imaging the surroundings of the vehicle and predict a vehicle collision based on an image captured by the imaging device.

  The correspondence between the constituent elements of the claims and the constituent elements of the embodiment is as follows. That is, the EEPROM 12 constitutes a first recording means, the collision detection sensor 20 constitutes a collision detection means, the EEPROM 13 constitutes a second recording means, and the CPU 10 constitutes an authentication means, a control means and a travel restriction means. In addition, the above description is an example to the last, and when interpreting invention, it is not limited to the correspondence of the component of said embodiment and the component of this invention at all.

The figure which shows the whole structure of the vehicle information recording device in one embodiment. The flowchart which shows the processing content performed by the information recording device for vehicles in one embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Information recording device, 2 ... Vehicle speed sensor, 3 ... Brake switch, 4 ... Throttle opening sensor, 5 ... Seat belt sensor, 6 ... Light switch, 7 ... Direction indication sensor, 10 ... CPU, 11 ... RAM, 12 ... EEPROM, 13 ... EEPROM, 14 ... backup power supply, 20 ... collision detection sensor, 30 ... vehicle controller

Claims (3)

First information that records unique information for each vehicle (hereinafter, vehicle-specific information), and once the vehicle-specific information is recorded, overwriting of the vehicle-specific information is prohibited,
Collision detection means for detecting or predicting a vehicle collision;
A second recording unit that records vehicle information if recording of information is permitted when a collision of the vehicle is detected or predicted by the collision detection unit;
Authentication means for authenticating the vehicle-specific information recorded in the first recording means;
If the authentication result by the authentication means is affirmative, the recording of the vehicle information to the second recording means is permitted, and if the authentication result by the authentication means is negative, the second information A vehicle information recording apparatus comprising: control means for prohibiting recording of vehicle information in the recording means. The vehicle information recording apparatus according to claim 1,
The vehicular information recording apparatus, wherein the authentication unit authenticates the vehicle specific information recorded in the first recording unit before the collision detection or the collision prediction by the collision detection unit. In the vehicle information recording device according to claim 1 or 2,
An information recording apparatus for a vehicle, further comprising a travel restricting unit that performs control for restricting the travel of the vehicle if the authentication unit does not authenticate the vehicle specific information.

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