JP2003252078A - On-vehicle magnetic storage unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle magnetic storage unit which can protect data from any vibration or impact while a vehicle is traveling. <P>SOLUTION: This on-vehicle magnetic storage unit 1A comprises a plurality of physically separated magnetic storage areas (an area 5a for significance 1, an area 5b for significance 2, and a copy area 5c for significance 1), detecting means 7a-7d to detect the condition of a vehicle, and a processing means to read/write the data from/in the magnetic storage areas 5a-5c by limiting the read/write of the data from/in the magnetic storage areas 5a-5c according to the condition of the vehicle. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle magnetic storage device, and more particularly to a technique for protecting stored data from vibration and shock.

[0002]

2. Description of the Related Art In recent years, due to the development of communication technology, it has become possible to perform data communication between the inside and the outside of a vehicle, and there is a tendency that various kinds of multimedia data can be obtained from the outside inside the vehicle. For this reason, vehicles tend to be equipped with a storage device for storing such multimedia data. Conventionally, as such a vehicle-mounted storage device,
Silicon memory devices have been used.

However, recently, music data, video data and the like are handled as multimedia data, and the data size of the multimedia data tends to increase rapidly. Therefore, the conventional silicon memory device has a problem of insufficient capacity.

Therefore, recently, a magnetic storage device such as a hard disk has attracted attention as a storage device capable of inexpensively storing a large amount of data.

[0005]

However, a magnetic storage device such as a hard disk was originally developed for a personal computer with very little vibration and shock, and the distance between the magnetic head and the disk is made very small. This has increased the memory density. At present, the interval is very small, about one air molecule. Therefore, such a magnetic storage device has a drawback in that the magnetic head and the disk come into contact with each other even if a slight vibration or shock is applied at the time of reading / writing data, and the disk is damaged, that is, the data is damaged.

Therefore, when such a magnetic storage device is mounted on a vehicle, there is a problem that data is damaged due to vibration or shock during traveling, and important data is damaged.

Therefore, an object of the present invention is to provide an on-vehicle magnetic storage device capable of protecting data from vibrations and shocks during traveling.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a plurality of magnetic storage areas physically separated from each other, a detection means for detecting a vehicle state, And a processing unit for reading / writing data from / into the magnetic storage areas so as to restrict reading / writing of data from / to the magnetic storage areas according to the vehicle state.

According to a second aspect of the present invention, the plurality of magnetic storage areas are hard disks.

According to a third aspect of the present invention, data of a predetermined importance is stored in each of the magnetic storage areas, and the processing means stores the importance of the data stored in the magnetic storage area. Accordingly, reading / writing of data from / to each magnetic storage area is restricted.

According to a fourth aspect of the present invention, a copy of the data stored in the magnetic storage area, which is physically separated from the plurality of magnetic storage areas and in which highly important data is stored, is stored. The storage means for copying, the processing means copies the data stored in the magnetic storage area in which the highly important data is stored to the copy storage area, and In other words, the data reading is performed without limiting the reading of the data according to the vehicle state.

According to a fifth aspect of the present invention, in the processing means, when the data copied to the copy storage area is damaged, the magnetic storage area in which the highly important data is stored again. The data stored in the above is copied to the copy storage area.

According to a sixth aspect of the present invention, the copy storage area is a silicon storage area.

According to a seventh aspect of the present invention, the processing means copies the data stored in the magnetic storage area in which the highly important data is stored to the copy storage area when the vehicle is stopped. It is a thing.

According to an eighth aspect of the present invention, the processing means stores the data stored in the magnetic storage area in which the highly important data is stored when the ignition key is removed, for the copy storage. It is to be copied to the area.

According to a ninth aspect of the present invention, the detecting means detects a shift position, a parking brake state, and / or a vehicle speed as the vehicle state.

[0017]

1 is a schematic diagram of the configuration of an in-vehicle magnetic storage device according to an embodiment of the present invention.

In-vehicle magnetic storage device 1 according to this embodiment
As shown in FIG. 1, A is a communication device 3 for performing data communication between the inside and the outside of the vehicle, a hard disk 5 for storing data received via the communication device 3, and a detection means 7a for detecting a vehicle state. 7d and a data processing device (processing means) 9 that reads / writes data from / into the hard disk 5 according to the vehicle state and performs necessary processing on the data.

The hard disk 5 has a plurality of physically separated magnetic storage areas 5a-5c (importance 1 area 5a,
An area 5b for importance 2 and a copy area 5c for importance 1 are provided. Data classified into importance 1 and importance 2 are stored in the importance 1 area 5a and the importance 2 area 5b, respectively. A copy of the data stored in the importance 1 area 5a is stored in the importance 1 copy area (copy storage area) 5c.

Here, the importance level 1 corresponds to, for example, data in which a fee is required for reacquisition of data when the data is damaged due to paid contents or the like. The importance level 2 corresponds to, for example, data in which the content can be obtained free of charge when the data is damaged. It is assumed that importance level 1 is higher than importance level 2.

Note that the separation of storage areas by folders and directories used in an OS such as Windows (registered trademark) is a logical classification, not a physical classification, so the term "physically separated" is used here. Multiple magnetic storage areas ”. As the “physically separated magnetic storage areas”, it is not necessary to specify the system that manages the file, but it is necessary that reading / writing can be performed in physically separated manner. As a result, even if one magnetic storage area is damaged, reading / writing of data in the other magnetic storage area can be ensured.

The detecting means 7a to 7d are, for example, a shift position sensor 7a for detecting the shift position of the vehicle, a vehicle speed sensor 7b for detecting the vehicle speed of the vehicle,
The vehicle includes a parking brake sensor 7c that detects whether or not the parking brake of the vehicle is applied, and an ignition key sensor 7d that detects whether or not the ignition key of the vehicle is ACC-off and removed.

The data processing device 9 performs reading / writing on each of the magnetic storage areas 5a to 5c in the hard disk 5, which will be described later, in accordance with the read (R) / write (W) restrictions in Table 1, for example.

[0024]

[Table 1]

In Table 1, reading / writing of the importance level 1 area 5a is permitted only when the vehicle is parked, and is prohibited when the vehicle is stopped or running. Reading / writing to the area 5b for importance level 2 and the copy area 5c for importance level 1
Both are permitted during parking, stopping, and running.

The data processing device 9 judges whether the vehicle is parked, stopped, or running as follows based on the detection results of the detection means 7a to 7d. In other words, whether or not the vehicle is parked is determined by whether or not the ignition key is ACC-off and removed. The determination as to whether or not the vehicle is stopped is made based on whether the shift position signal is P, whether or not the parking break is pulled, and whether or not the vehicle speed is zero, or a combination thereof. It Whether or not the vehicle is running is determined by whether or not the vehicle speed exceeds zero.

Of the data received via the communication device 3, the data processing device 9 classifies the data that needs to be stored into the importance level 1 or the importance level 2 according to the importance level, According to the classified importance, according to Table 1, it is written and saved in the importance 1 area 5a or the importance 2 area 5b in the hard disk 5.

At this time, when the data processing device 9 receives the data of importance level 1 when the vehicle is stopped or running, the data processing device 9 temporarily stores the data in the copy area 5c for importance level 1, and at the next parking, The saved data is restored from the importance level 1 copy area 5c to the importance level 1 area 5a. More specifically, when the data processing device 9 temporarily stores the received data of importance level 1 in the importance level 1 copy area 5c,
A flag indicating that new data is stored in the copy area 5c for importance level 1 is set. Then, the data processing device 9
Confirms the presence / absence of the flag at each parking, and if the flag is present, new data (that is, the importance 1 concerned) stored in the copy area 5c for importance 1 at the time of parking at the confirmation Data) is copied from the importance level 1 copy area 5c to the importance level 1 area 5a and saved again. This allows
Even when data of importance level 1 is received when the vehicle is stopped or running, the data can be appropriately saved in the importance level 1 copy area 5c.

Further, the data processing device 9 is in accordance with Table 1.
At the time of ACC-off (when parking), all the data in the importance level 1 area 5a is read out and all copied to the importance level 1 copy area 5c. After the next ACC-on, it is important when the vehicle is stopped or running. When it is necessary to read the data in the degree 1 area 5a, the copy data copied to the degree 1 importance copy area 5c is read instead of reading from the degree 1 importance area 5a. Each time the data processing device 9 saves new data in the importance level 1 area 5a, the data processing apparatus 9 performs a full copy from the importance level 1 area 5a to the importance level 1 copy area 5c. Update the copy data in.

Since a large amount of data is handled when a full copy is made from the area 1a for importance 1 to the copy area 5c for importance 1 as described above, such a full copy is certainly performed not when the vehicle is stopped. It is performed when ACC-off is stopped (that is, when parking). For this reason, it is assumed that the vehicle is equipped with a power control mechanism that can perform (only) all such copies when ACC-off.

Further, the data processing device 9 receives shock / vibration while reading the copy data from the importance level 1 copy area 5c when the vehicle is stopped or running, and the copy data in the importance level 1 copy area 5c is applied. If is damaged, at the time of the next parking (or after displaying the message to stop the vehicle to make a full copy and confirming that the vehicle has stopped), the area 1 for importance level 1 will be transferred to the copy area for importance level 1 5c. Copy all the data of the above again, and copy area 5 for importance level 1
Restore the copy data in c. This makes it important 1
It is possible to ensure the reading of data from the copy area 5c for data.

Further, if data corruption occurs while downloading data via the communication device 3, the data processing device 9 downloads the data again.

According to the on-vehicle magnetic storage device 1A constructed as described above, since the magnetic storage areas 5a to 5c are physically separated from each other, the magnetic storage area 5a to
Even if 5c is damaged, the reading / writing of data from / to the other magnetic storage areas 5a-5c can be ensured, and the data in the other magnetic storage areas 5a-5c can be protected.

Further, since the reading / writing of data to / from the importance level 1 area 5a and the importance level 2 area 5b is restricted according to the vehicle state, it is possible to read / write data to / from each magnetic storage area 5a, 5b. It is possible to prevent the occurrence of vibrations and shocks, and protect the data in the magnetic storage areas 5a and 5b from damage due to vibrations and shocks.

Further, since the magnetic storage areas 5a to 5c are hard disks, they are inexpensive.

Further, data of a predetermined importance level is stored in the importance level 1 area 5a and the importance level 1 area 5b, and data is read / written to / from each magnetic storage area 5a, 5b according to the importance level. Since writing is restricted, the data in the magnetic storage areas 5a and 5b can be protected from being damaged depending on the degree of importance.

Further, a copy area 5c for importance level 1 is provided, and the copy area 5c for importance level 1 has a copy area 5 for importance level 1.
The data in a is copied, and the data of high importance is copied to the copy area 5c for importance 1 because the data is read without being restricted according to the vehicle state. The copy area 5c for importance 1
Can be read freely without being limited to the vehicle state. As a result, on the magnetic storage area 5a side, data can be protected from being damaged by limiting the reading / writing of data according to the vehicle state and the degree of importance, and on the side of the importance level 1 copy area 5c, the state can be limited to the vehicle state. Therefore, it is possible to freely read highly important data without compromising the robustness of data protection and the freedom of reading data.

Further, since the copying of data from the importance level 1 area 5a to the importance level 1 copy area 5c is carried out when the vehicle is stopped, it is possible to prevent the occurrence of vibrations and shocks during the copying, and the importance level 1
The data in the use area 5a can be protected from damage due to vibration or shock. Furthermore, since the ignition key is removed as a condition when the vehicle is stopped, there is no vibration or shock due to running, and there is no reading / writing of data from / to other devices to the importance level 1 area 5a. Therefore, it is possible to reliably prevent the occurrence of vibration and shock during copying,
The data in the area 1 for importance 1 can be protected from damage due to vibration or shock.

Further, since the shift position, the state of the parking brake, and / or the vehicle speed are detected as the vehicle state, the vehicle state can be detected based on the existing equipment without installing a new detector.

In this embodiment, all of the importance 1 area 5a, the importance 2 area 5b, and the importance 1 copy area 5c are magnetic storage areas (that is, the hard disk 5). However, those magnetic storage areas 5a-
Part of 5c is configured as a silicon memory device (silicon storage area), and is parked and running (or running)
The data may be read / written only to the silicon memory device, and the data may be read / written to / from the hard disk 5 when the vehicle is stopped (or when the vehicle is stopped and parked). By doing so, the reliability of data protection can be further improved.

FIG. 2 shows, as an example, a schematic configuration diagram of an on-vehicle magnetic storage device 1B in which the importance level 1 copy area 5c is configured as a silicon memory device 15. This on-vehicle magnetic storage device 1B has the same configuration as that of the on-vehicle magnetic storage device 1A of FIG. 1 except that the copy area 5c for importance level 1 is configured as the silicon memory device 15.
Detailed description is omitted.

In this way, since the copy area 5c for importance 1 is a silicon memory device, for example, it is highly resistant to vibrations and shocks. Therefore, vibrations and shocks are read during data reading during running and parking. Even if it occurs, the data in the copy area 5c for importance 1 can be protected from damage due to vibration or shock.

[0043]

According to the first aspect of the present invention, since the magnetic storage areas are physically separated from each other, even if one magnetic storage area is damaged, another magnetic storage area is created. It is possible to secure the reading / writing of data to and from it and protect the data in other magnetic storage areas.

Further, since the reading / writing of data from / to each magnetic storage area is restricted according to the vehicle state, it is possible to prevent the occurrence of vibration / shock at the time of reading / writing data from / to the magnetic storage area, and to prevent the magnetic storage area from being generated. The data inside can be protected from damage due to vibration or shock.

According to the second aspect of the present invention, since the plurality of magnetic storage areas are hard disks, they can be inexpensively constructed.

According to the third aspect of the present invention, each magnetic storage area stores data of a predetermined importance, and reading / writing of data to each magnetic storage area is restricted according to the importance. Therefore, the data in the magnetic storage area can be protected from being damaged according to the importance.

According to the fourth aspect of the invention, the copy storage area is provided, and the highly important data in the magnetic storage area is copied to the copy storage area. The data is read without restricting the reading of the data according to the vehicle state. Therefore, highly important data can be freely read from the copy storage area without being limited to the vehicle state. it can. As a result, on the magnetic storage area side, data can be protected from damage by limiting the reading / writing of data according to the vehicle state and importance, and on the copy storage area side, the data can be protected without being limited to the vehicle state. Therefore, highly important data can be read, and both the robustness of data protection and the freedom of reading data can be achieved.

Further, since the copy storage area is physically separated from the plurality of magnetic storage areas, even if the copy storage area is damaged, data reading / writing from / to the plurality of magnetic storage areas can be performed. The data can be secured and the data in the plurality of magnetic storage areas can be protected.

According to the fifth aspect of the invention, when the data copied to the copy storage area is damaged,
Since the data is copied again from the magnetic storage area to the copy storage area, the degree of freedom of reading data from the copy storage area can be ensured.

According to the sixth aspect of the invention, since the copy storage area is a silicon storage area, it has high resistance to vibration and shock. Therefore, even if vibration or shock occurs during data reading, The data in the copy storage area can be protected from damage due to vibration or shock.

According to the invention described in claim 7, since the data is copied from the magnetic storage area to the copy storage area when the vehicle is stopped, it is possible to prevent the occurrence of vibration or impact during copying.
Data in the magnetic storage area can be protected from damage due to vibration or shock.

According to the invention described in claim 8, since the data is copied from the magnetic storage area to the copy storage area when the ignition key is removed, there is no vibration or shock due to running, and other equipment There is no need to read / write data from / into the magnetic storage area. Therefore, it is possible to reliably prevent the occurrence of vibration or shock during copying, and protect the data in the magnetic storage area from damage due to vibration or shock.

According to the ninth aspect of the invention, since the shift position, the state of the parking brake, and / or the vehicle speed are detected as the vehicle state, the existing equipment can be installed without installing a new detector. The vehicle state can be detected based on the.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vehicle-mounted magnetic storage device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a modified example of the in-vehicle magnetic storage device according to the embodiment of the present invention.

[Explanation of symbols]

1A, 1B In-vehicle magnetic storage device 5 hard disk 5a Area for importance level 1 5b Area for importance level 2 5c Copy area for importance level 1 7a Shift position sensor 7b Vehicle speed sensor 7c Parking brake sensor 7d ignition key sensor 9 Data processing device 15 Recon memory device

Continued front page    (72) Inventor Yasuhiko Nishi             1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi             Auto Network Technical Laboratory Co., Ltd. (72) Inventor Futoshi Nishida             1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi             Auto Network Technical Laboratory Co., Ltd. F-term (reference) 3D037 FA19

Claims (9)

[Claims] 1. A plurality of magnetic storage areas physically separated from each other, detection means for detecting a vehicle state, and reading / writing of data to / from each magnetic storage area is restricted according to the vehicle state. And a processing unit for reading / writing data to / from each of the magnetic storage areas. 2. The in-vehicle magnetic storage device according to claim 1, wherein the plurality of magnetic storage areas are hard disks. 3. Data of a predetermined importance is stored in each of the magnetic storage areas, and the processing means stores the magnetic storage according to the importance of the data stored in the magnetic storage area. The on-vehicle magnetic storage device according to claim 1 or 2, wherein reading / writing of data with respect to an area is restricted. 4. A copy storage area, which is physically separated from the plurality of magnetic storage areas and stores a copy of the data stored in the magnetic storage area in which highly important data is stored. The processing means copies the data stored in the magnetic storage area in which the highly important data is stored to the copy storage area, and the copy storage area is set to the vehicle state. The in-vehicle magnetic storage device according to claim 3, wherein the data is read without restricting the reading of the data accordingly. 5. The processing means, when the data copied to the copy storage area is damaged,
The in-vehicle magnetic storage device according to claim 4, wherein the data stored in the magnetic storage area in which the highly important data is stored is copied to the copy storage area. 6. The in-vehicle magnetic storage device according to claim 4, wherein the copy storage area is a silicon storage area. 7. The processing means copies the data stored in the magnetic storage area in which the highly important data is stored to the copy storage area when the vehicle is stopped. The in-vehicle magnetic storage device according to any one of claims 4 to 6. 8. The processing means copies the data stored in the magnetic storage area in which the highly important data is stored to the copy storage area when an ignition key is removed. The vehicle-mounted magnetic storage device according to claim 4. 9. The detecting means sets the vehicle state as
Shift position, parking brake status, and /
Alternatively, the vehicle-mounted magnetic storage device according to any one of claims 1 to 8, which detects a vehicle speed.