JP6969103B2 - Electronic control device - Google Patents

Description

The present disclosure relates to an electronic control device that writes data to a non-volatile memory such as a flash memory.

Conventionally, a flash memory is known as an example of a non-volatile memory in which data can be rewritten. In a flash memory, data is generally written or read for each unit area, which is a predetermined storage area of about several bytes.

Patent Document 1 proposes a technique for writing data to such a flash memory and rewriting the written data.

Japanese Unexamined Patent Publication No. 2011-203809

Flash memory is used in devices in various fields such as communication devices, AV devices, and devices that control vehicles. Moreover, in recent years, the control has become more complicated, and the amount of data used in the control of these devices has also increased.

In a flash memory as described in Patent Document 1, data is written for each unit area. Therefore, if it is attempted to write the data used for controlling the above-mentioned device to the flash memory as it is, there may be a problem that the writing time becomes long.

The present disclosure provides a technique for reducing the data writing time.

The electronic control device (10) of the present disclosure at least writes data. The electronic control device includes a setting determination unit (S10), an address unit (S50), and a write instruction unit (S90).

The setting determination unit determines whether or not there is a setting request indicating a request for setting a setting value indicating a setting for the electronic control device to a specified value which is one of a plurality of candidate values for the set value. When there is a setting request, the address unit acquires a matching address, which is an address indicating an area in which a candidate value matching a specified value is stored among a plurality of candidate values. The write instruction unit is an execution unit that writes data representing a matching address to the set value storage area, which is a storage area pre-allocated to the set value, for each predetermined storage unit area. Have them write in (15).

Here, since the data is written for each storage unit area, the writing time increases as the amount of data to be written increases.
According to such a configuration, since the data representing the matching address is written, for example, when the matching address has a smaller amount of data than the specified value, compared to writing the data representing the specified value set as the setting value as it is. For example, the data writing time can be shortened.

In addition, the reference numerals in parentheses described in this column and the scope of claims indicate the correspondence with the specific means described in the embodiment described later as one embodiment, and the technical scope of the present disclosure is defined. It is not limited.

The block diagram which shows the structure of the electronic control apparatus 10. The figure explaining the writing of the destination value. The figure explaining the candidate value with respect to the destination value. It is a figure explaining that the flash memory 16 includes the storage area for the destination value which stores the destination value. The flowchart of the writing process of 1st Embodiment. The figure which shows the correspondence information. The flowchart of the execution process of 1st Embodiment. The figure which shows the example of the operation by the writing process of 1st Embodiment. The flowchart of the reading process of 1st Embodiment. The figure which shows the example of the operation by the reading process of 1st Embodiment. The flowchart of the writing process of 2nd Embodiment. The figure which shows the example of the operation by the writing process of 2nd Embodiment. The figure which shows the example of correspondence information in another embodiment. The figure which shows the example of the writing data in another embodiment. The figure which shows the configuration example of the memory in another embodiment. The figure which shows the example of the in-vehicle system in which the candidate value is stored in the memory included in a certain ECU among a plurality of ECUs in another embodiment. The figure which shows the example of the in-vehicle system in which the candidate value is stored in the HDD in another embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. First Embodiment]
[1-1. composition]
The electronic control unit (hereinafter referred to as ECU) 10 shown in FIG. 1 is a device mounted on a vehicle and used. The own vehicle referred to below means a vehicle on which the ECU 10 is mounted.

The ECU 10 includes a well-known microcomputer (hereinafter, microcomputer) 11 having a CPU 12 for overall control of the ECU, semiconductor memories (hereinafter, memory 19) such as ROM 13, RAM 14, and flash memory 16, and a controller 15. It is composed in the center. Various functions of the ECU 10 are realized by the CPU 12 executing a program stored in a non-transitional substantive recording medium. In this example, the memory 19 corresponds to a non-transitional substantive recording medium in which a program is stored. In addition, when this program is executed, the method corresponding to the program is executed. The number of microcomputers 11 constituting the ECU 10 may be one or a plurality.

The ECU 10 realizes various functions assigned to the ECU 10 in order to control the own vehicle by executing the program by the CPU 12. The method for realizing various functions of the ECU 10 is not limited to software, and some or all of the elements may be realized by using one or a plurality of hardware. For example, when the above function is realized by an electronic circuit which is hardware, the electronic circuit may be realized by a digital circuit including a large number of logic circuits, an analog circuit, or a combination thereof.

The ECU 10 includes a microcomputer 11, an I / O 17, and a power supply circuit 18.
Specifically, the ECU 10 transmits / receives control data, which is data for controlling the own vehicle, to and from another ECU (not shown) connected by the communication line 5 via the I / O 17 to control the ECU 10. Various functions assigned to the ECU 10 are realized based on the data.

Further, the ECU 10 can be connected to the external device 9 by the communication line 5 via the I / O 17. In response to a request from the external device 9 connected via the I / O 17, the ECU 10 designates the set value, which is the information specified by the external device 9 and represents the setting for the ECU 10, by the external device 9. Set to the indicated value, which is the specified value.

The power supply circuit 18 receives electric power from a battery (not shown) mounted on the own vehicle, and supplies electric power to each part of the ECU 10 such as the CPU 12, ROM 13, RAM 14, controller 15, flash memory 16, and controller 15.

The ROM 13 stores a program executed by the CPU 12, and as the program, a flash memory driver for causing the controller 15 to control the flash memory 16 and various applications are stored. Further, the ROM 13 stores candidate values described later.

The flash memory 16 is a rewritable memory. As an example, the flash memory 16 writes or reads data for each 2-byte storage area (hereinafter, storage unit area). Further, the flash memory 16 includes a storage area for set values, which will be described later.

The CPU 12 controls the controller 15 by operating according to the flash memory driver, and writes and reads data to and from the flash memory 16.
The controller 15 controls the flash memory 16, which is a memory in which data can be rewritten and data is written for each predetermined storage unit area, according to an instruction from the CPU 12.

In this embodiment, an example in which the ECU 10 configured in this way is connected to the external device 9 via the I / O 17 will be described.
The external device 9 is a device external to the ECU 10 and is configured to output a setting request or an acquisition request to the ECU 10.

When there is a setting request from the external device 9, the ECU 10 executes a writing process described later. The setting request is a request to set the setting value specified by the external device 9 to a designated value designated by the external device 9 which is one of a plurality of candidate values for the setting. Further, the ECU 10 executes a read process described later when there is an acquisition request from the external device 9. The acquisition request is a request to read a value set as a set value specified by the external device 9.

The set value referred to here represents the type of setting for the ECU 10, and a plurality of candidate values that the set value can take are predetermined. The set value may include, for example, a destination value described later.

Here, the destination value will be described. Generally, in an electronic control unit such as an ECU 10, as shown in FIG. 2, for example, by storing a destination value in a flash memory 16 before shipping a vehicle, management of destinations such as domestic and North American destinations is managed. It is carried out. The destination value is set to "None" at the time of shipment of the ECU 10. That is, nothing is set as the destination value, and a predetermined initial value indicating that the destination value is not set is written in the flash memory 16. Then, before the vehicle is shipped from the manufacturing factory, the designated value specified by the external device 9 in the setting request from the external device 9 is written in the flash memory 16 as the destination value.

FIG. 2 shows an example in which a setting request designated by "domestic" as a designated value is input from the external device 9, and this "domestic" is written in the ECU 10 as a destination value. The ECU 10 is assembled to the vehicle after the destination value is written. Then, the vehicle is shipped after the assembly.

A plurality of candidate values are preset for such set values. The candidate value is a value that is a candidate for the set value. That is, it is a predetermined value that the set value can take. For example, for the above-mentioned destination value, which is one of the set values, as shown in Fig. 3, "initial value", "domestic", "North America", "Europe", and "Middle East" Candidate values such as are set. In this embodiment, the candidate value is represented by 6 bytes.

In the ECU 10, as described above, these plurality of candidate values are stored in the ROM 13, specifically, in the area indicated by the predetermined address in the ROM 13.

For example, in the example in which the destination value is set, the "initial value", which is one of the candidate values, is stored in the area indicated by the address such as 0x00002000, as shown in FIG. 6 described later. In addition, "domestic" is stored in the area indicated by the address such as 0x00002006.

In this embodiment, the address is represented by 4 bytes. That is, in the present embodiment, the address indicating the storage area in the ROM 13 is set to have a smaller amount of data than the candidate value.

As described above, the flash memory 16 includes a storage area for set values. The set value storage area is a storage area in the flash memory 16 that is allocated in advance for each set value with respect to the set value. For example, as shown in FIG. 4, the area represented by the address R1 in the flash memory 16 is allocated as the set value storage area for the above-mentioned destination value which is one of the set values. The set value storage area allocated to the destination value is also referred to as the destination value storage area.

As described above, the external device 9 is configured to output to the ECU 10 a setting request for setting one candidate value selected from the plurality of candidate values as the set value. Further, the external device 9 is configured to output to the ECU 10 an acquisition request for reading the value of the set value set in one of the plurality of candidate values from the set value storage area for the set value. ing.

[1-2. process]
Next, the process executed by the CPU 12 will be described.
[1-2-1. Write process]
First, the writing process executed by the CPU 12 will be described with reference to the flowchart shown in FIG. The writing process is a process of setting a set value to a designated value according to a setting request from the external device 9. The writing process is repeatedly executed triggered by the connection with the external device 9.

In S10, the CPU 12 determines whether or not there is a setting request from the external device 9. The CPU 12 shifts the process to S30 when there is a setting request, and ends the main writing process when there is no setting request.

The CPU 12 acquires correspondence information in S30, which is shifted when there is a setting request from the external device 9. The correspondence information is information stored in ROM 13 in advance, and corresponds to a set value, a plurality of candidate values for the set value, and an address indicating an area in ROM 13 in which each of the candidate values is stored. Information that represents a relationship.

For example, the correspondence information with the destination value as the set value is shown as shown in FIG.
The CPU 12 specifies a matching address in the subsequent S50. The matching address referred to here is an address indicating an area in the ROM 13 in which a candidate value that matches a designated value is stored among a plurality of candidate values.

For example, when there is a setting request to set "domestic" as a specified value for a destination value as a set value, the CPU 12 has a plurality of candidate values for the destination value based on the correspondence information shown in FIG. From among, the address of the area where the candidate value matching the specified value "for domestic use" is stored is specified, and the specified address is acquired as the matching address. That is, 0x00002006 is acquired as a matching address.

The CPU 12 generates write data in the subsequent S70. The write data means data that the CPU 12 writes to the set value storage area. In the present embodiment, the CPU 12 generates data representing a matching address as write data.

For example, when there is a setting request with the destination value as the set value and "domestic" as the specified value, the CPU 12 generates 0x00002006, which is a matching address, as write data for the destination value storage area.

In S90, the CPU 12 performs an execution process of writing the write data to the controller 15 in the set value storage area.
For example, when there is a setting request with the destination value as the set value and "domestic" as the specified value, the CPU 12 uses 0x00002006, which is data representing the matching address, as write data for the destination value storage area R1. The write data is written to the controller 15. As a result, in the destination value storage area R1, 0x00002000, which is the address where the initial value is stored in the ROM 13, is overwritten, and 0x00002006, which is the address where 0x100000000000 representing "domestic" is stored, is newly written.

When the CPU 12 finishes writing the write data to the set value storage area, the CPU 12 ends the main write process.
Subsequently, the execution process executed in S90 in the write process will be described with reference to the flowchart shown in FIG.

As shown in FIG. 7, the CPU 12 acquires the write data generated in S70 in S110.
In S120, the CPU 12 causes the controller 15 to write data in the flash memory 16 for each storage unit area. In this embodiment, 2 bytes are used as the storage unit area. However, the storage unit area is not limited to this, and can be arbitrarily set such as, for example, 4 bytes.

In S130, the CPU 12 determines whether or not there is unwritten data, and repeatedly executes writing until there is no unwritten data.
According to such a writing process, when there is a setting request from the external device 9 to set the destination value to "domestic", as shown in FIG. 8, the CPU 12 is a candidate for "domestic". It operates to write 0x0000200C, which is 4-byte data indicating a matching address, to the destination value storage area instead of 0x100000000000, which is 6-byte data indicating the value.

Since the writing of data into the flash memory 16 is performed for each storage unit area, the smaller the amount of data to be written, the shorter the writing time to the flash memory 16. That is, according to this writing process, since the matching address is written in the flash memory 16, the writing time is shortened as compared with the case where the candidate value is written in the flash memory 16.

[1-2-2. Read process]
Next, the reading process executed by the CPU 12 will be described with reference to the flowchart shown in FIG. The read process is a process of acquiring a set value according to an acquisition request. Here, an example in which an acquisition request is output from the external device 9 will be described. The read process is repeatedly executed triggered by the connection with the external device 9. The acquisition request can also be output from any device connected to the ECU 10. The acquisition request can also be output from the ECU 10.

In S210, the CPU 12 determines whether or not there is an acquisition request. The acquisition request is a request for the external device 9 to acquire the value of the set value.
In S220, the CPU 12 acquires a matching address from the set value storage area when it is determined in S210 that there is an acquisition request.

For example, when there is an acquisition request to acquire the destination value, the CPU 12 acquires 0x0000200C, which is a matching address, from the destination value storage area R1 in the flash memory 16.
In S230, the CPU 12 acquires the candidate value stored in the area indicated by the matching address as the set value requested to be acquired in the acquisition request, and ends the main reading process.

According to such a read process, for example, when there is an acquisition request for acquiring the destination value from the external device 9, the CPU 12 is stored in the area indicated by the matching address 0x0000200C as shown in FIG. It works to get 0x100000000000, which is a candidate value and represents "domestic".

[1-3. effect]
According to the first embodiment described in detail above, the following effects are obtained.
(1a) The ECU 10 writes at least data. In the ECU 10, the CPU 12 determines in S10 whether or not there is a setting request representing a request for setting a set value representing a setting for the ECU 10 to a designated value which is one of a plurality of candidate values for the set value. ..

Further, in S50, the CPU 12 acquires a matching address, which is an address indicating an area in which a candidate value matching the designated value is stored among the plurality of candidate values, when there is a setting request. Then, in S90, the CPU 12 causes the controller 15 to write the data representing the matching address in the set value storage area, which is the storage area preliminarily allocated to the set value, for each predetermined storage unit area. The plurality of candidate values are stored in a rewritable memory, that is, in the present embodiment, in the flash memory 16.

Here, since the data is written in the flash memory 16 for each storage unit area, the time for writing the data to the flash memory 16 increases as the amount of data to be written increases.

According to the present embodiment, since the data representing the matching address, which is the address, is written, the flash is performed, for example, when the matching address has a smaller amount of data than the specified value, rather than writing the data representing the specified value as the setting value. The time for writing data to the memory 16 can be shortened.

Further, a plurality of candidate data are written in advance in the ROM 13. According to this, the specified value to be written as the setting value can be selected from a plurality of candidate values.
(1b) The data representing the matching address is configured so that the amount of data is smaller than the data representing the specified value. According to this, when writing the matching address, the writing time can be shortened as compared with the case where the specified value is written.

(1c) In S30, the CPU 12 acquires correspondence information indicating the correspondence relationship between the set value, the plurality of candidate values, and the address indicating the area in which each of the candidate values is stored.

In S50, the CPU 12 specifies an address indicating an area in which a candidate value that matches a specified value among a plurality of candidate values is stored, using the correspondence information when there is a setting request. That is, the CPU 12 acquires the address specified in S50 as a matching address.

According to this, since the configuration is provided to acquire the correspondence information and specify the matching address, the matching address can be specified by the ECU 10 itself.
(1d) In S210, the CPU 12 determines whether or not there is an acquisition request, which is a request for acquiring a set value. In S220, the CPU 12 acquires a matching address from the set value storage area when there is an acquisition request. In S220, the CPU 12 acquires the candidate value stored in the area indicated by the matching address as the set value requested to be acquired in the acquisition request.

According to this, when there is an acquisition request, the candidate value stored in the area indicated by the matching address written in the set value storage area is acquired as the set value. Therefore, it is possible to shorten the data writing time when setting the set value as in (1a), and to acquire the candidate value requested by the acquisition request as the set value.

The ECU 10 corresponds to an electronic control device, and the controller 15 corresponds to an execution unit.
Further, S10 corresponds to the processing as the setting determination unit, S30 corresponds to the processing as the correspondence acquisition unit, S50 corresponds to the processing as the address unit and the specific unit, and S90 corresponds to the processing as the writing instruction unit. Correspondingly, S90 corresponds to the processing as a write instruction unit. Further, S210 corresponds to the processing as the acquisition determination unit, S220 corresponds to the processing as the address acquisition unit, and S230 corresponds to the processing as the set value acquisition unit.

[2. Second Embodiment]
[2-1. Differences from the first embodiment]
Since the basic configuration of the second embodiment is the same as that of the first embodiment, the differences will be described below. It should be noted that the same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description will be referred to.

In the first embodiment described above, the address of the area in which the candidate value is stored in the ROM 13 is represented by an absolute address. On the other hand, the second embodiment differs from the first embodiment in that the address is represented by a relative address. Along with this, in the second embodiment, S55 is added in the writing process, and S70 and S90 are replaced with S75 and S95.

[2-2. process]
Next, the writing process executed by the CPU 12 of the second embodiment in place of the writing process shown in FIG. 5 of the first embodiment will be described with reference to the flowchart of FIG. Since the processing of S10-S50 and S90 in FIG. 11 is the same as the processing of S10-S50 and S90 in FIG. 5, the description is partially simplified.

In the writing process of the present embodiment, the CPU 12 specifies the matching address in S50 and shifts the process to S55.
The CPU 12 converts the matching address into a relative address in S55. The relative address here is a relative value of the absolute address with respect to the reference address. The reference address can be set to any absolute address in the ROM 13.

In the present embodiment, 0x00002000, which is the start address of the candidate value storage area, is set as the reference address. The reference address is stored in the ROM 13 in advance. The candidate value storage area is an area in which a plurality of candidate values for the set values are stored, which is set by the setting request.

In this embodiment, as shown in FIG. 12, three candidate values such as "initial value", "domestic", and "North American" are set as candidate values for the destination value. Each of these candidate values is represented by 6 bytes as in the above embodiment. That is, the area represented by the absolute addresses 0x00002000 to 0x00002012 in the ROM 13 corresponds to the candidate value storage area for the destination value.

In this step, if the specified value is set to "domestic" in the setting request, the absolute address such as 0x00002006 is converted to the relative value such as 0x00000006. Similarly, if the specified value is set to "For North America" in the setting request, an absolute address such as 0x0000200C is converted to a relative value such as 0x0000000C. That is, the relative values of these candidate values with respect to the absolute address are the same in the upper 3 bytes of the 4 bytes, that is, 0, and can be identified by using only the lower 1 byte of the 4 bytes. The lower 1 byte is a size corresponding to the size of the candidate value storage area.

In S75, the CPU 12 sets data representing the relative value converted in S55 as write data.
In S95, the CPU 12 causes the controller 15 to write the write data to the destination value storage area, and ends the main write process. In this embodiment, in particular, the CPU 12 writes data only for the lower 1 byte of the 4-byte write data which is the data representing the relative value. That is, among the write data representing the relative value, only the data having a predetermined data length from the lower byte is written. The predetermined data length is a data length according to the size of the candidate site storage area.

When the CPU 12 finishes writing the write data to the set value storage area, the CPU 12 ends the main write process.
According to such a writing process, when there is a setting request from the external device 9 to set the destination value to "domestic", as shown in FIG. 12, the CPU 12 is not a match address but a match. Operates to write the relative value of the address to the destination value storage area. In particular, in the present embodiment, only the predetermined data length of the relative values of the matching address, that is, 0x06, which is the lower 1 byte of the relative value of the matching address, is set as the area corresponding to the lower 1 byte of the destination value storage area. Write. According to this, since the relative value of the matching address is written in the flash memory 16, the writing time is shortened as compared with the case where the matching address for 4 bytes is written in the flash memory 16.

When there is an acquisition request to acquire the destination value from the external device 9, the relative value of the matching address stored in the destination value storage area is acquired, and the relative value is used as the absolute address based on the reference address. Then, the same process as the read process of the first embodiment may be performed using the converted absolute address.

[2-3. effect]
According to the second embodiment described in detail above, the effect (1a) of the above-mentioned first embodiment is achieved, and the following effects are further achieved.

(2a) The address indicating the area where the candidate value is stored is represented by a relative value from a specified address which is a predetermined address in the ROM 13. According to this, since the relative value of the matching address is written in the storage area for the set value, the writing time can be shortened as compared with the case where the matching address is written.

[3. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be variously modified and implemented.

(3a) In the above embodiment, the operation of the ECU 10 is described with the destination value as the set value, but the set value is not limited to one destination value. In addition to the destination value, the set value is preset, for example, the initial set temperature of the air conditioner preset for each destination value, constants used for various calculations preset for each destination value, and the like. Various settings may be included. In addition, various set values set for each vehicle body, such as the initial value of the tire pressure predetermined for each vehicle body and the smart key identification number predetermined for each vehicle body, are set as the destination value. Can be included.

The ECU 10 may be configured to use these plurality of set values. According to this, since the writing time is shortened for each set value, more writing time can be shortened as the ECU 10. In this case, as shown in FIG. 13, the correspondence information acquired in S30 has a correspondence relationship between the set value, the plurality of candidate values, and the address indicating the area in which each of the candidate values is stored. It may represent each set value.

(3b) In the above embodiment, the data representing the matching address is generated as the write data, but the present invention is not limited to this. The written data may include, for example, data including at least one of management information and identification information (hereinafter, ID) together with a matching address. As shown in FIG. 14, an example including an ID, a matching address, and management information as write data is shown. The management information is information for managing the history of rewriting of the matching address, and may be, for example, information indicating whether or not the matching address has been rewritten, when it has been rewritten, and the like. The ID is information representing a setting request, and may be, for example, an identification number set for each setting request.

The flash memory 16 is provided with a plurality of blocks including, for example, a storage area of several tens of bytes, such as the first block to the nth block, and data can be erased collectively for each block 100. For example, it may be configured so that several tens of bytes of write data including an ID, a matching address, and management information are assigned to each block 100.

However, the size of the block in the flash memory 16 is not limited to this. The block may consist of a storage area of several kilobytes. In this case, a block may contain a plurality of tens of bytes of write data including an ID, a matching address, and management information.

(3c) In the above embodiment, the candidate value data stored in the ROM 13 is represented by 6 bytes, and the address indicating these stored areas is represented by 4 bytes. However, it is not limited to this. The data of the candidate value and the address in the ROM 13 can be represented by an arbitrary amount of data.

(3d) In the above embodiment, a plurality of candidate values for the set values are set in advance, but the present invention is not limited to this. One candidate value for the set value may be set in advance.
(3e) In the above embodiment, in the second embodiment, the reference address is set to the start address of the candidate value storage area, but the reference address is not limited to this. The reference address can be set to any value in the ROM 13. The reference address is preferably set to an arbitrary address in the candidate value storage area. Further, it is more desirable that the reference address is set to either the start address or the last address in the candidate value storage area as in the above embodiment, for example.

(3f) In the above embodiment, the set value storage area and the area in which a plurality of candidate values are stored in advance are configured as different memories, the former as a flash memory 16 and the latter as a ROM 13. However, the present invention is not limited to this. An area in which a plurality of candidate values are stored in advance may be stored in a rewritable memory different from the flash memory 16.

For example, as shown in FIG. 15, in the memory 19, the flash memory 16 has a plurality of flash memories 16a and 16b, the flash memory 16a is used as the flash memory 16 in the above embodiment, and the flash memory 16b is a plurality. It may be used as a second storage unit in which the candidate value of is stored. According to this, it is possible to rewrite a plurality of candidate values.

Although not shown, the set value storage area and the area in which a plurality of candidate values are stored in advance may be included in the same rewritable memory, for example, in the flash memory 16 in FIG. ..

(3g) In the above embodiment, a plurality of candidate values are stored in the flash memory 16 which is a memory in the ECU 10, but the present invention is not limited to this. The plurality of candidate values may be stored in an external storage device provided outside the ECU 10.

Specifically, as shown in FIG. 16, in the in-vehicle system 1 which is a system mounted on a vehicle, the own ECU 10a is communicably connected to a plurality of other ECUs 10b and 10c by a communication line 5. At least one of the other ECUs 10b and 10c includes a memory for storing data such as a ROM and a flash memory.

Here, the plurality of candidate values may be stored in the memory included in at least one of the plurality of other ECUs 10b and 10c. For example, it may be stored in a memory included in another ECU 10b. The memory of the other ECU 10b referred to here may include both a non-rewritable memory such as a ROM and a rewritable memory such as a flash memory.

According to this, since a plurality of candidate values for the set values are stored in the memory of the other ECU 10b, the own ECU 10a uses the area for storing the plurality of candidate values to store other information. Is possible. For example, when the set value is commonly used by a plurality of ECUs, such as a destination value, a greater effect is achieved.

Although an example in which the own ECU 10a is communicably connected to a plurality of other ECUs 10b and 10c has been described here, the number of other ECUs connected to the own ECU 10a is not limited to this. .. For example, the own ECU 10a may be communicably connected to at least one other ECU 10b, and may be configured so that a plurality of candidate values are stored in the memory of the other ECU 10b.

By the way, in the present embodiment, the own ECU 10a may be configured to include a setting determination unit, an address unit, a correspondence acquisition unit, and a specific unit to specify a matching address, similarly to the ECU 10 of the above embodiment. Alternatively, the own ECU 10a may not be provided with a specific unit and may be configured to acquire a matching address. In the latter case, for example, the other ECU 10b is configured to include a setting determination unit, an address unit, a correspondence acquisition unit, and a specific unit in the same manner as the ECU 10 of the above embodiment, so that the own ECU 10a is separated from the other ECU 10b. It may be configured to get a matching address.

(3h) In the above (3g), a plurality of candidate values are stored in the memory provided in the other ECU 10b, but the storage device in which the plurality of candidate values are stored is not limited to this. A plurality of candidate values may be stored in a storage device such as a Hard Disk Drive (hereinafter, HDD). The HDD 30 is a storage device in which data can be rewritten. Here, the HDD will be described as an example, but the present invention is not limited to this, and the HDD may be any storage device that functions as a data storage unit for storing data and can rewrite the data.

Specifically, in the in-vehicle system 2 shown in FIG. 17, the own ECU 10d is communicably connected to another ECU 10e and one HDD 30 by a communication line 5. The own ECU 10d and the other ECU 10e are provided with a setting determination unit, an address unit, a correspondence acquisition unit, and a specific unit, and may be configured to specify a matching address, similarly to the ECU 10 of the above embodiment. The own ECU 10d is configured to share the HDD 30 together with the other ECUs 10e. Here, a plurality of candidate values may be stored in the HDD 30.

According to this, it is not necessary for each of the own ECU 10d and the other ECU 10e to have a storage area for storing a plurality of candidate values. That is, the storage area in which these plurality of candidate values are stored can be effectively used for storing other information.

There may be a plurality of other ECUs communicably connected to the own ECU 10d, and the own ECU 10d may be configured to share the HDD 30 with the plurality of other ECUs. Further, the own ECU 10d and the other ECU 10e may be configured not to have a specific unit.

(3i) In the above embodiment, an example of the correspondence information is shown as shown in FIG. 6, but the mode of the correspondence information is not limited to this. The correspondence information is not limited to the table format shown in FIG. 6, and may be represented in any form as long as it indicates the correspondence between the candidate value and the address indicating the area in which the candidate value is stored. Further, the address indicating the area in which the candidate value is stored may be represented in any manner. For example, an address indicating an area in which a candidate value is stored may be represented by using a few upper bits or a lower number of bits in a data string indicating an address.

(3j) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. .. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

(3k) In addition to the above-mentioned ECU 10, CPU 12, and in-vehicle system 1, this program is in various forms such as a program for operating the CPU 12, a non-transitional actual recording medium such as a semiconductor memory in which this program is recorded, and a data storage method. Disclosure can also be achieved.

1 in-vehicle system, 10 ECU, 12 CPU, 13 ROM, 15 controller, 16 flash memory, 19 memory.

Claims (7)

At least an electronic control device (10) that writes data.
A setting determination unit (S10) for determining whether or not there is a setting request indicating a request for setting a setting value indicating a setting for the electronic control device to a specified value which is one of a plurality of candidate values for the setting value. When,
An address indicating an area in which the candidate value matching the specified value is stored among the plurality of candidate values in the candidate value storage area in which the plurality of candidate values are stored in advance when the setting request is made. The address part (S50) for acquiring the matching address, which is
The execution unit (15) that writes data representing the matching address to the set value storage area, which is a storage area preliminarily allocated to the set value, for each predetermined storage unit area. A writing instruction unit (S90) for writing, and
Electronic control device equipped with. The electronic control device according to claim 1.
The data representing the matching address is an electronic control device having a smaller amount of data than the data representing the specified value. The electronic control device according to claim 1 or 2.
A correspondence acquisition unit (S30) for acquiring correspondence information indicating a correspondence relationship between the set value, the plurality of candidate values, and an address indicating an area in which each of the candidate values is stored.
When there is a setting request, a specific unit (S50) that specifies an address indicating an area in which a candidate value that matches a specified value among the plurality of candidate values is stored, using the corresponding information, and a specific unit (S50).
Further prepare
The address unit is an electronic control device that acquires an address specified by the specific unit as the matching address. The electronic control device according to any one of claims 1 to 3.
An acquisition determination unit (S210) for determining whether or not there is an acquisition request, which is a request for acquiring the set value, and
When there is the acquisition request, the address acquisition unit (S220) that acquires the matching address from the set value storage area, and the address acquisition unit (S220).
A setting value acquisition unit (S230) that acquires the candidate value stored in the area indicated by the matching address as the setting value requested to be acquired by the acquisition request.
An electronic control device further equipped with. The electronic control device according to any one of claims 1 to 4.
The address indicating the area in which the candidate value is stored is an electronic control device represented by a relative value from a predetermined address, which is a predetermined address. The electronic control device according to any one of claims 1 to 5.
An electronic control device configured to use a plurality of the above set values. The electronic control device according to any one of claims 1 to 6.
An electronic control device in which the plurality of candidate values are stored in a storage device provided outside the electronic control device.

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