JP6975581B2 - Vehicle information storage device - Google Patents

Description

The present invention relates to a vehicle information storage device mounted on a vehicle and storing vehicle information indicating the state of the vehicle.

Conventionally, a vehicle information storage device that is mounted on a vehicle and stores vehicle information indicating the state of the vehicle has been known. For example, with respect to a vehicle self-diagnosis function (OBD; On-Board Diagnostics), various techniques for improving the reliability of failure diagnosis information sequentially stored in a non-volatile memory have been proposed.

Patent Document 1 proposes a device for determining an abnormality in the storage state of a non-volatile memory by storing the same failure code (DTC; Diagnostic Trouble Code) in three storage areas and taking a majority vote of the data. ing.

Japanese Patent No. 4475320

Recently, engine ECUs (Electronic Control Units) compatible with OBD2 are becoming widespread. This ECU simultaneously stores not only the failure code but also the freeze frame data at the moment when the failure code is generated.

However, in the device proposed in Patent Document 1, it is necessary to always prepare three sets of storage areas for majority voting, so that the capacity of the non-volatile memory used increases by 50% as compared with the case of two sets. Will end up. This problem is noticeable because the capacity used is roughly proportional to the size of the freeze frame data.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a vehicle information storage device capable of ensuring the reliability of stored data while reducing the used capacity of the non-volatile memory.

The vehicle information storage device according to the present invention is a vehicle information storage device mounted on a vehicle and storing vehicle information indicating the state of the vehicle, and is a non-volatile memory having a first storage area and a second storage area. A volatile memory that temporarily stores the number of times the vehicle information is rewritten and the latest vehicle information, and a storage control unit that controls the storage of the non-volatile memory and the volatile memory. The 1 storage area includes a first information storage area in which the vehicle information is stored, and a first number storage area in which the first rewrite number indicating the number of rewrites of the first information storage area is stored. The 2 storage area includes a second information storage area in which the vehicle information is stored, and a second number storage area in which the second rewrite count indicating the number of rewrites of the second information storage area is stored. control unit, before starting the updating of the first information storage area, writing said latest vehicle information, and said first rewrite count read from the first count storage area in the volatile memory, and, The unused value not used for counting the first rewrite count is written in the first storage area, and the latest vehicle information written in the volatile memory before starting the update of the first information storage area is used. after was further new said first information storage area on the basis of, the volatile said first number of times of rewriting count update read from the memory, and the updated first number of times of rewriting in the first count storage area Before the writing storage control is performed and the update of the second information storage area is started, the second rewriting count read from the second information storage area is written to the volatile memory, and the second rewriting count is reached. The second information based on the latest vehicle information written in the volatile memory before starting the update of the first information storage area by writing the unused value not used for counting to the second number storage area. after was further new storage area, the volatile said second number of times of rewriting count update read from the memory, and performs the storage control to write the updated second number of times of rewriting in the second count storage area.

With this configuration, for example, even if the information temporarily stored in the volatile memory is lost due to a momentary power interruption, the numerical relationship between the two currently stored rewrites (single value). Alternatively, the update status of the first storage area and the second storage area can be determined based on the relative value), and the stored data can be appropriately restored by taking necessary measures thereafter. As a result, the reliability of the stored data can be ensured while reducing the used capacity of the non-volatile memory.

Further, in the storage control unit, the number of times of rewriting stored in the first number of times storage area is the unused value, and the number of times of rewriting stored in the second number of times storage area is the said unused value. If not, the storage that duplicates the rewriting number of times in the second number storage area and writes it in the first number storage area, and duplicates the vehicle information in the second information storage area and writes it in the first information storage area. When the number of rewrites stored in the first number storage area is not the unused value and the number of rewrites stored in the second number storage area is the unused value, the control is performed. A storage control is performed in which the number of rewrites in the first number storage area is duplicated and written in the second number storage area, and the vehicle information in the first information storage area is duplicated and written in the second information storage area. May be good.

As a result, in a state where one storage area whose rewrite count is an unused value is being updated, it is possible to return to the latest storage state by duplicating the rewrite count and vehicle information from the other storage area.

Further, when the number of rewrites stored in the first number of times storage area is larger than the number of times of rewrites stored in the second number of times storage area, the storage control unit may use the vehicle in the first information storage area. When the storage control of duplicating the information and writing it to the second information storage area is performed, and the number of rewrites stored in the first number storage area is smaller than the number of rewrites stored in the second number storage area. , The vehicle information in the second information storage area may be duplicated and storage control may be performed to write the vehicle information in the first information storage area.

As a result, in a state where one storage area having a large number of rewrites has been updated and the other storage area has not been updated, the vehicle information is duplicated from one storage area to shift to the latest storage state. be able to.

Further, the storage control unit may not write to the first storage area and the second storage area other than the duplication until the storage control for duplicating the vehicle information is completed. By prohibiting writing other than duplication during the recovery of the stored data, it is possible to prevent the occurrence of an abnormality related to the storage state.

Further, the vehicle information storage device may be stopped from supplying electric power according to the off operation of the ignition switch of the vehicle. This is especially effective for vehicles that do not have a self-shutdown function after the engine is turned off, as it is not possible to obtain a data backup of volatile memory.

According to the vehicle information storage device according to the present invention, the reliability of the stored data can be ensured while reducing the capacity of the non-volatile memory used.

It is an overall block diagram of the vehicle failure diagnosis system which incorporated the vehicle information storage device in one Embodiment of this invention. It is a transition diagram regarding the storage state of the non-volatile memory and the volatile memory shown in FIG. 1. It is a figure which shows typically the feature of the memory control in each section.

Hereinafter, a vehicle information storage device according to the present invention will be described with reference to suitable embodiments with reference to the accompanying drawings.

[Configuration of vehicle failure diagnosis system 10]
FIG. 1 is an overall configuration diagram of a vehicle failure diagnosis system 10 incorporating a vehicle information storage device according to an embodiment of the present invention. The vehicle failure diagnosis system 10 is a system mounted on a vehicle (for example, a two-wheeled vehicle or a four-wheeled vehicle) (not shown) and having a self-diagnosis function of this vehicle. The vehicle failure diagnosis system 10 includes an engine ECU 12 as a vehicle information storage device, a sensor group 14, an engine 16, and a power supply 18.

The sensor group 14 is composed of one or a plurality of sensors capable of detecting the state of the vehicle. Examples of the type of sensor include a water temperature sensor, an oil temperature sensor, a vehicle speed sensor, a crank angle sensor, an intake pressure sensor, an atmospheric pressure sensor, a throttle opening sensor, and an O2 sensor.

The power supply 18 supplies electric power to each part of the vehicle (including the engine ECU 12). Here, the power supply 18 supplies electric power to the engine ECU 12 or stops the supply thereof in conjunction with the on / off of the ignition switch 20.

The engine ECU 12 controls the operation of the engine 16 which is a drive source of the vehicle, and acquires and stores information indicating the state of the vehicle (hereinafter referred to as vehicle information) as necessary. Specifically, the engine ECU 12 includes an arithmetic processing unit 22, a non-volatile memory 24, and a volatile memory 26.

The arithmetic processing unit 22 is composed of, for example, a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit). The arithmetic processing unit 22 functions as a storage control unit 28 that controls storage for the non-volatile memory 24 and the volatile memory 26 by reading and executing a program from a ROM (Read Only Memory) (not shown).

The non-volatile memory 24 is a memory that can hold stored data without supplying power, and is composed of, for example, an EEPROM (Electrically Erasable Programmable Read-Only Memory) and a flash memory. The non-volatile memory 24 has two storage areas having the same area size (hereinafter, the first storage area 30 and the second storage area 32).

The first storage area 30 includes a first number storage area 30n in which one rewrite number Nr1 is stored, and a first information storage area 30v in which vehicle information Iv1 of M group (M ≧ 1) is stored. .. The second storage area 32 includes a second number storage area 32n in which one rewrite number Nr2 is stored, and a second information storage area 32v in which the vehicle information Iv2 of the M group (M ≧ 1) is stored. ..

The number of rewrites Nr1 is the number of times that the first storage area 30 is successfully rewritten (update of vehicle information Iv1), and the number of rewrites Nr2 is the number of times that the second storage area 32 is successfully rewritten (update of vehicle information Iv2). be. Further, the vehicle information Iv1 and Iv2 correspond to, for example, one set of information of a failure code (DTC) and freeze frame data (time series of sensor values).

The volatile memory 26 is a memory capable of holding stored data only in a state where power is supplied, and is composed of, for example, a DRAM (Dynamic Random Access Memory) or a SRAM (Static Random Access Memory). The volatile memory 26 has a storage area 34 in which information necessary for storage control (specifically, the first rewriting number A, the second rewriting number B, and the latest vehicle information Iv) is temporarily stored.

[Operation of engine ECU 12]
The engine ECU 12 as a vehicle information storage device is configured as described above. Subsequently, the operation of the engine ECU 12 (particularly, the storage control unit 28) will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a transition diagram relating to the storage states of the non-volatile memory 24 and the volatile memory 26 shown in FIG. More specifically, this figure shows the stepwise change of the stored value in the first storage area 30, the second storage area 32, and the storage area 34 in each of the processing steps S0 to S10. The location (storage area) where the stored value was updated is indicated by a thick rectangular frame.

Step S0 corresponds to the storage state in which the fifth rewriting is normally performed. In this case, the number of rewrites Nr1 (= 5) in the first storage area 30 is equal to the number of rewrites Nr2 (= 5) in the second storage area 32. Further, the vehicle information Iv1 in the first storage area 30 all coincides with the vehicle information Iv2 in the second storage area 32. The value of "Null" is stored in the storage area 34 by the initialization operation of the storage control unit 28.

In step S1, the storage control unit 28 controls to temporarily store the latest vehicle information Iv by writing the latest vehicle information (hereinafter referred to as the latest vehicle information Iv) from the sensor group 14 to the volatile memory 26. .. As a result, the stored value (latest vehicle information Iv) of the storage area 34 is updated from "NULL" to "sixth information".

In step S2, the storage control unit 28 temporarily stores the latest vehicle information Iv by reading the rewrite count Nr1 of the first storage area 30 from the non-volatile memory 24 and writing it to the storage area 34 of the volatile memory 26. Take control. As a result, the stored value (first rewriting count A) of the storage area 34 is updated from "NULL" to "5".

In step S3, the storage control unit 28 updates the rewrite count Nr1 of the first storage area 30 (specifically, the first number storage area 30n) to a value not used for counting (hereinafter referred to as an unused value). Take control. This unused value may be an arbitrary value (specifically, a value larger than the upper limit value) that deviates from the operation range of the number of rewrites Nr1, including 0.

In this way, the storage control unit 28 writes the rewrite number Nr1 read from the first information storage area 30n to the volatile memory 26 and writes the rewrite number Nr1 to the volatile memory 26 before starting the update of the first information storage area 30v. Storage control is performed to write the unused value not used for counting to the first storage area 30n (steps S2 and S3).

In step S4, the storage control unit 28 controls to read the temporarily stored latest vehicle information Iv from the volatile memory 26 and write it to the first storage area 30 of the non-volatile memory 24. As a result, the stored value (vehicle information Iv1) of the first information storage area 30v is updated from the "fifth information" to the "sixth information".

In step S5, the storage control unit 28 reads the temporarily stored first rewrite number A from the volatile memory 26, updates the count (A ← A + 1), and then puts it in the first storage area 30 of the non-volatile memory 24. Controls writing. As a result, the stored value (rewriting count Nr1) of the first number storage area 30n is updated from "0" to "6".

In this way, the storage control unit 28 counts and updates the rewrite count Nr1 read from the volatile memory 26 after the update of the first information storage area 30v is completed, and writes to the first information storage area 30n. (Steps S4 and S5).

In step S6, the storage control unit 28 reads the rewrite count Nr2 of the second storage area 32 from the non-volatile memory 24 and writes it to the storage area 34 of the volatile memory 26 to temporarily store the rewrite count Nr2. I do. As a result, the stored value (second rewrite count B) of the storage area 34 is updated from "NULL" to "5".

In step S7, the storage control unit 28 controls to update the rewrite number Nr2 stored in the second storage area 32 (specifically, the second number storage area 32n) to the unused value (0). Here, the unused value of the number of rewrites Nr2 may be the same as or different from the unused value of the number of rewrites Nr1.

In this way, the storage control unit 28 writes the rewrite number Nr2 read from the second information storage area 32n to the volatile memory 26 and writes the rewrite number Nr2 to the volatile memory 26 before starting the update of the second information storage area 32v. Storage control is performed to write the unused value not used for counting to the second storage area 32n (steps S6 and S7).

In step S8, the storage control unit 28 controls to read the temporarily stored latest vehicle information Iv from the volatile memory 26 and write it to the second storage area 32 of the non-volatile memory 24. As a result, the stored value (vehicle information Iv2) of the second information storage area 32v is updated from the "fifth information" to the "sixth information".

In step S9, the storage control unit 28 reads the temporarily stored second rewrite number B from the volatile memory 26, updates the count (B ← B + 1), and then puts it in the second storage area 32 of the non-volatile memory 24. Controls writing. As a result, the stored value (rewriting count Nr2) of the second number storage area 32n is updated from "0" to "6".

In this way, the storage control unit 28 counts and updates the rewrite count Nr2 read from the volatile memory 26 after the update of the second information storage area 32v is completed, and writes to the second information storage area 32n. (Steps S8 and S9).

Step S10 corresponds to the storage state in which the sixth rewriting is normally performed. The value of "Null" is stored in the storage area 34 by the initialization operation of the storage control unit 28. Here, the number of rewrites Nr1 (= 6) in the first storage area 30 is equal to the number of rewrites Nr2 (= 6) in the second storage area 32. Further, the vehicle information Iv1 in the first storage area 30 all coincides with the vehicle information Iv2 in the second storage area 32.

FIG. 3 is a diagram schematically showing the characteristics of memory control in each section. More specifically, this figure shows the behavior (events and results) of the memory control for each processing timing when the status check processing is executed.

Here, the "state check" is a confirmation process for the storage state of the non-volatile memory 24, and specifically, means confirming whether or not the number of rewrites Nr1 and the number of rewrites Nr2 match. .. Further, the processing phases are classified by 10 sections (1st to 10th sections) shown in FIG.

The storage control unit 28 may execute this state check process irregularly or periodically. As an irregular example, [1] when a read request is made to the non-volatile memory 24, [2] immediately after the ignition switch 20 is turned on, or [3] a predetermined time has elapsed from the end of a series of operations shown in FIG. When, is mentioned.

In the first to third sections, the number of rewrites Nr1 and Nr2 are equal to each other (Nr1 = Nr2 = 5). In this case, the storage control unit 28 determines that the vehicle information Iv1 and Iv2 are both up-to-date, and does not perform any special processing on the non-volatile memory 24. That is, the non-volatile memory 24 maintains a state in which the fifth vehicle information Iv1 and Iv2 are stored (a state in which data synchronization is maintained).

In the fourth and fifth sections, the rewrite count Nr1 stored in the first count storage area 30n is an unused value (that is, Nr1 = 0), and the rewrite count Nr2 stored in the second count storage area 32n is Not an unused value (Nr2 = 5). In this case, the memory control unit 28 determines that only the vehicle information Iv2 is the latest.

That is, in a state where one storage area (first storage area 30) in which the rewrite count Nr1 is an unused value is being updated, the rewrite count Nr2 and the vehicle information Iv2 are obtained from the other storage area (second storage area 32). It can be restored to the latest storage state by duplicating it.

In this case, the storage control unit 28 duplicates [1] (Nr1 ← Nr2) the rewriting number Nr2 of the second number storage area 32n and writes it to the first number storage area 30n, and [2] (Iv1 ← Iv2) th. 2 Memory control is performed in which the vehicle information Iv2 in the information storage area 32v is duplicated and written in the first information storage area 30v. As a result, the non-volatile memory 24 returns to the state in which the fifth vehicle information Iv1 and Iv2 are stored (that is, the state in which the data synchronization is maintained).

Here, the storage control unit 28 does not write to the first storage area 30 and the second storage area 32 other than the duplication until the storage control for replicating the vehicle information Iv2 is completed. By prohibiting writing other than duplication during the recovery of the stored data, it is possible to prevent the occurrence of an abnormality related to the storage state.

In the sixth and seventh sections, the number of rewrites Nr1 (= 6) and Nr2 (= 5) are not unused values, and the magnitude relationship of Nr1> Nr2 is satisfied. In this case, the memory control unit 28 determines that only the vehicle information Iv1 is the latest.

That is, in a state where one storage area (first storage area 30) having a large number of rewrites Nr1 is after the update and the other storage area (second storage area 32) is before the update, the first storage area 30 By duplicating the vehicle information Iv1 from, it is possible to shift to the latest storage state.

In this case, the storage control unit 28 duplicates [1] (Nr2 ← Nr1) the rewriting number Nr1 of the first number storage area 30n and writes it to the second number storage area 32n, and [2] (Iv2 ← Iv1) th. A storage control is performed in which the vehicle information Iv1 in the 1 information storage area 30v is duplicated and written in the second information storage area 32v. Instead of duplicating the number of rewrites Nr1, the count-updated number of rewrites Nr2 may be written in the second number storage area 32n.

As in the case of the fourth and fifth sections, the storage control unit 28 goes to the first storage area 30 and the second storage area 32 other than the duplication until the storage control for replicating the vehicle information Iv1 is completed. Do not write. As a result, the non-volatile memory 24 is in a state of storing the sixth vehicle information Iv1 and Iv2 (that is, a state in which data synchronization is maintained).

In the 8th and 9th sections, the number of rewrites Nr1 stored in the first storage area 30n is not an unused value (Nr1 = 6), and the number of rewrites Nr2 stored in the second storage area 32n is an unused value. (That is, Nr2 = 0). In this case, the memory control unit 28 determines that only the vehicle information Iv1 is the latest.

That is, in a state where one storage area (second storage area 32) in which the rewrite count Nr2 is an unused value is being updated, the rewrite count Nr1 and the vehicle information Iv1 are obtained from the other storage area (first storage area 30). By duplicating, it is possible to move to the latest storage state.

In this case, the storage control unit 28 duplicates [1] (Nr2 ← Nr1) the rewriting number Nr1 of the first number storage area 30n and writes it to the second number storage area 32n, and [2] (Iv2 ← Iv1) th. A storage control is performed in which the vehicle information Iv1 in the 1 information storage area 30v is duplicated and written in the second information storage area 32v.

As in the case of the sixth and seventh sections, the storage control unit 28 goes to the first storage area 30 and the second storage area 32 other than the duplication until the storage control for replicating the vehicle information Iv1 is completed. Do not write. As a result, the non-volatile memory 24 is in a state of storing the sixth vehicle information Iv1 and Iv2 (that is, a state in which data synchronization is maintained).

In the tenth section, the number of rewrites Nr1 and Nr2 are equal to each other (Nr1 = Nr2 = 6). In this case, the storage control unit 28 determines that the vehicle information Iv1 and Iv2 are both up-to-date, and does not perform any special processing on the non-volatile memory 24. That is, the non-volatile memory 24 maintains a state in which the vehicle information Iv1 and Iv2 for the sixth time are stored (a state in which data synchronization is maintained).

[Effect of engine ECU 12 (vehicle information storage device)]
As described above, the engine ECU 12 is mounted on the vehicle and stores the vehicle information Iv1 and Iv2 indicating the state of the vehicle. [1] The non-volatile memory 24 having the first storage area 30 and the second storage area 32. [2] The volatile memory 26 that stores at least the number of rewrites Nr1 and Nr2 of the vehicle information Iv1 and Iv2, and [3] the storage control unit 28 that controls the storage of the non-volatile memory 24 and the volatile memory 26. [4] The first storage area 30 includes a first information storage area 30v in which vehicle information Iv1 is stored and a first number storage area 30n in which rewrite count Nr1 is stored, and [5] a second. The storage area 32 includes a second information storage area 32v in which the vehicle information Iv2 is stored, and a second information storage area 32n in which the rewrite count Nr2 is stored.

Then, [6] the storage control unit 28 writes (6a) the number of rewrites Nr1 read from the first number storage area 30n to the volatile memory 26 before starting the update of the first information storage area 30v, and (6b). ) An unused value (= 0) that is not used for counting the number of rewrites Nr1 is written in the first number storage area 30n. [7] After the update of the first information storage area 30v is completed, the storage control unit 28 counts and updates the rewrite count Nr1 read from (7a) the volatile memory 26, and (7b) enters the first information storage area 30n. Performs memory control for writing.

Then, [8] the storage control unit 28 writes (8a) the number of rewrites Nr2 read from the second number storage area 32n to the volatile memory 26 before starting the update of the second information storage area 32v, and (8b). ) An unused value (= 0) that is not used for counting the number of rewrites Nr2 is written in the second number storage area 32n. [9] After the update of the second information storage area 32v is completed, the storage control unit 28 counts and updates the rewrite count Nr2 read from (9a) the volatile memory 26, and (9b) enters the second information storage area 32n. Performs memory control for writing.

With this configuration, for example, even if the information temporarily stored in the volatile memory 26 is lost due to a momentary power interruption, the two currently stored numerical values Nr1 and Nr2 are rewritten. The update status of the first storage area 30 and the second storage area 32 can be determined based on the relationship (single value or relative value), and the stored data can be appropriately restored by taking necessary measures thereafter. As a result, the reliability of the stored data can be ensured while reducing the used capacity of the non-volatile memory 24.

Further, it is more preferable to apply it to the engine ECU 12 in which the supply of electric power is stopped according to the off operation of the ignition switch 20 of the vehicle. It is particularly effective in a vehicle that does not have a self-shutdown function after the engine 16 is turned off because the data backup of the volatile memory 26 cannot be obtained.

[supplement]
It should be noted that the present invention is not limited to the above-described embodiment, and of course, it can be freely changed without departing from the gist of the present invention. Alternatively, each configuration may be arbitrarily combined as long as there is no technical contradiction.

For example, in this embodiment, the update is performed according to the update order of the first storage area 30 → the second storage area 32, but in the reverse update order (that is, the second storage area 32 → the first storage area 30). You may. Further, as long as data synchronization is maintained, the update order does not have to be fixed.

Further, in this embodiment, one rewrite number Nr1 is stored in the first number storage area 30n, but an area capable of storing two or more of the same value is provided to achieve so-called data multiplexing. May be good. Specifically, when all the values match, it is determined as a normal value, or the stored value is determined by a majority vote, so that the reliability of the data synchronization process is further improved. The same applies to the second number storage area 32n (rewrite number Nr2).

10 ... Vehicle failure diagnosis system 12 ... Engine ECU (vehicle information storage device)
14 ... Sensor group 16 ... Engine 18 ... Power supply 20 ... Ignition switch 22 ... Arithmetic processing device 24 ... Non-volatile memory 26 ... Volatile memory 28 ... Storage control unit 30 ... First storage area 30n ... First number storage area 30v ... First 1 Information storage area 32 ... Second storage area 32n ... Second number of times storage area 32v ... Second information storage area 34 ... Storage area Iv1, Iv2 ... Vehicle information Nr1, Nr2 ... Number of rewrites

Claims (5)

A vehicle information storage device mounted on a vehicle and storing vehicle information indicating the state of the vehicle.
A non-volatile memory having a first storage area and a second storage area,
Volatile memory that temporarily stores the number of times the vehicle information is rewritten and the latest vehicle information,
A storage control unit that controls storage for the non-volatile memory and the volatile memory,
Equipped with
The first storage area includes a first information storage area in which the vehicle information is stored, and a first number storage area in which the first rewrite number indicating the number of rewrites of the first information storage area is stored.
The second storage area includes a second information storage area in which the vehicle information is stored, and a second number storage area in which the second rewrite number indicating the number of rewrites of the second information storage area is stored.
The memory control unit
Before starting the updating of the first information storage area, the write and the latest vehicle information, and said first rewrite count read from the first count storage area in the volatile memory, and, the first rewrite Write the unused value not used for counting the number of times to the first number storage area,
After was further new said first information storage area based on the latest vehicle information written in the volatile memory before starting the updating of the first information storage area, the read from the volatile memory A storage control is performed to count and update the first rewrite count and write the updated first rewrite count to the first rewrite storage area.
Before starting the update of the second information storage area, the second rewrite count read from the second information storage area is written to the volatile memory, and is not used for counting the second rewrite count. The value is written in the second storage area,
After was further new said second information storage region based on the latest vehicle information written in the volatile memory before starting the updating of the first information storage area, the read from the volatile memory A vehicle information storage device characterized by performing storage control for counting and updating the number of times of second rewriting and writing the updated number of times of second rewriting to the second number of times storage area. In the vehicle information storage device according to claim 1,
The memory control unit
When the first rewrite count stored in the first count storage area wherein a nonuse value, and wherein the second number of times of rewriting stored in the second count storage area wherein not unused value,
A storage control that duplicates the second rewriting number of the second information storage area and writes it in the first information storage area, and duplicates the vehicle information in the second information storage area and writes it in the first information storage area. And
If the stored in said first count storage area instead of the first number of times of rewriting the unused value, and wherein the second number of times of rewriting stored in the second count storage area wherein a unused value,
A storage control that duplicates the first rewriting number of times in the first number storage area and writes it in the second information storage area, and duplicates the vehicle information in the first information storage area and writes it in the second information storage area. A vehicle information storage device characterized by performing. In the vehicle information storage device according to claim 1,
The memory control unit
Wherein said first number of times of rewriting stored in the first count storage area is greater than said second number of times of rewriting stored in the second count storage area, duplicating the vehicle information of the first information storage area , Performs storage control to write to the second information storage area,
The first rewrite count stored in the first count storage area is smaller than the second number of times of rewriting stored in the second count storage area, duplicating the vehicle information of the second information storage area , A vehicle information storage device characterized in that storage control for writing to the first information storage area is performed. In the vehicle information storage device according to claim 2 or 3.
The storage control unit is characterized in that it does not write to the first storage area and the second storage area other than the duplication until the storage control for duplicating the vehicle information is completed. Storage device. In the vehicle information storage device according to any one of claims 1 to 4.
A vehicle information storage device characterized in that the supply of electric power is stopped in response to an off operation of the ignition switch of the vehicle.

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