JP4311067B2 - Data rewriting method and electronic control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data rewriting method and an electronic control device for an electronic control device including a plurality of microcomputers that execute a control process for controlling a predetermined control object, and in particular, a control program stored in a nonvolatile memory of each microcomputer. The present invention relates to a data rewriting method and an electronic control device that can rewrite data and control data.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an electronic control unit (ECU) for controlling an automobile engine, a microcomputer (for example, a so-called flash memory built-in CPU) having a nonvolatile memory such as a flash EEPROM capable of electrically rewriting data is provided. A control program and control data for engine control stored in a memory can be rewritten even after being supplied to the market (see Patent Document 1).
[0003]
By the way, in recent years, in this type of ECU, those equipped with a plurality of microcomputers have become mainstream as control contents become more complicated. Therefore, it is required to rewrite the control program and control data for each of the plurality of microcomputers.
[0004]
As this rewriting method, for example, each microcomputer adopts a configuration of daisy chain connection to the external communication line, and each microcomputer is transmitted from the outside before performing processing for performing the rewriting operation. A technique has been proposed in which a value obtained by performing a predetermined calculation on an incoming identification number is stored as its own identification number, and the identification number after the calculation is transmitted to a microcomputer at the next stage. (See Patent Document 2).
[0005]
In this technique, for example, when a plurality of nonvolatile memories are continuously rewritten, data is transmitted to and received from the memory rewriting device for each microcomputer to be rewritten, and a command to shift to the writing mode is received from the memory rewriting device. The process of shifting to the writing mode from the microcomputer was continuously performed.
[0006]
In addition, the microcomputers that enter the write mode are grouped, and if it is necessary to rewrite even one of the groups, all the microcomputers in the group are set in the write mode because of the main and slave relationships. Was rushed into.
[0007]
For example, as shown in FIG. 7A, the memory rewriting device side (tool side) selects a parameter file storing various data such as the number of memories and memory size required for data rewriting (steps). 1000), an ID is assigned to each component in the group (that is, a microcomputer) and a write mode entry command is transmitted (step 1010), and the rewrite data is transmitted with the ID of the target component (step 1020). The rewriting of the target part was checked (steps 1030 and 1040).
[0008]
Accordingly, as shown in FIG. 7B, the ECU side receives the write mode entry command and enters the write mode (step 1100), receives ID + rewrite data (step 1110), and sequentially. The target part was rewritten (step 1120).
[0009]
[Patent Document 1]
JP-A-6-272611 (Page 2, FIG. 1)
[Patent Document 2]
JP-A-9-160766 (2nd page, FIG. 1)
[0010]
[Problems to be solved by the invention]
However, the technique of Patent Document 2 described above is not always sufficient.
In other words, there are various types of ECUs, for example, for engine control and body control. For this reason, the number and types of microcomputers accommodated in the ECU are various, and therefore further improvement in workability and the like has been desired.
[0011]
Specifically, as shown in FIG. 8, for example, a 6-cylinder engine ECU (ECU1) has an ID of $ 01 (component A: CPU for engine control), $ 02 (component B: CPU for electronic throttle control monitoring), When three microcomputers of $ 03 (part C: for knock control) are accommodated, and the ID is $ 01 (part A ′: engine / knock control CPU) in the 4-cylinder engine ECU (ECU2). In the case where one microcomputer is accommodated, the memory rewriting device side needs to prepare separate parameter files 1, 2,... For each ECU.
[0012]
Therefore, an operator who performs rewriting selects a parameter file by referring to many materials corresponding to, for example, a vehicle type, an engine type, an ECU part number, a rewrite target part (a microcomputer including a nonvolatile memory), and the like. It was necessary and the work was difficult.
[0013]
In fact, since there are so many parameter files, there is a problem that if a parameter file is selected by mistake, a rewrite error occurs.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a data rewriting method and an electronic device capable of easily and surely rewriting a plurality of control programs and control data in each provided microcomputer. It is to provide a control device.
[0014]
[Means for solving the problems and effects of the invention]
  (1) The invention according to claim 1 is a data rewrite for rewriting data in the nonvolatile memory to an electronic control device having a plurality of microcomputers having a nonvolatile memory capable of electrically rewriting data. In the method, among the plurality of microcomputers, a predetermined representative microcomputer specifies ID information for rewriting the data and another microcomputer in the predetermined storage area of the predetermined microcomputer. ID information for rewriting the data is stored in advance, and the representative microcomputer, ThroughShin lineThroughconnectorConnected to the external toolElectrically connectedThe aboveIn response to a request from an external tool, for rewriting the data stored in advance in a predetermined storage area of the representative microcomputerIncluding the representative microcomputer itselfThe ID information of all the microcomputers is transmitted to the external tool via the communication line, and the external tool receiving the ID information is the rewrite data of the microcomputer to be rewritten determined based on the ID information. Is transmitted to the microcomputer to be rewritten via the communication line, and the microcomputer to be rewritten that has received the rewrite data transmitted from the external tool via the communication line receives the rewritten data. And rewriting data in its own nonvolatile memory.
[0015]
In other words, in the present invention, a representative microcomputer is designated from among a plurality of microcomputers arranged in the electronic control device, and rewriting of data in the representative microcomputer (for example, nonvolatile memory is prohibited). ID area for specifying the representative microcomputer itself and ID information for specifying another microcomputer (for example, in the same electronic control unit) are stored in the area.
[0016]
  And when there is a request from an external tool (memory rewrite device),All data for rewriting data stored in the specified storage area of the representative microcomputerID information of the microcomputer (that is, ID information of the representative microcomputer and ID information of other microcomputers in the same electronic control unit)Report)To the external tool.
[0017]
  Therefore, on the external tool side, for example, necessary information such as the number of microcomputers for rewriting data can be obtained in the same electronic control unit. Based on this ID information, parameters necessary for data rewriting are obtained. The file can be determined.
  And since the external tool transmits the rewrite data regarding the microcomputer to be rewritten determined based on the transmitted ID information to the microcomputer to be rewritten, the microcomputer to be rewritten stores the data in the nonvolatile memory. Can be rewritten.
[0018]
As a result, there is an effect that the labor of selecting the parameter file by referring to many materials corresponding to the parts to be rewritten as in the past can be greatly reduced.
In addition, since the parameter file is determined based on the ID information transmitted from the electronic control unit side, it is possible to effectively prevent a rewrite error without erroneously selecting the parameter file as in the past. Can do.
[0020]
  (2Claim2In the invention, when rewriting the data,Of the plurality of microcomputers having the nonvolatile memory, the rewrite targetMicrocomputerIn response to an instruction from the external toolEntering the writing mode for writing the dataDoIt is characterized by that.
  Therefore, data can be rewritten in the microcomputer in the writing mode.
[0022]
  (3Claim3In the invention ofThe representative microcomputer isIn response to a request from the external tool, in addition to the ID information,Predetermined and stored in a predetermined storage area of the representative microcomputerWrite modeAfter rushingRewrite order information that indicates the order of microcomputers that are actually rewrittenTo the external toolIt is characterized by transmitting.
[0023]
  In the present invention, when there is a request from an external tool, rewrite order information in addition to ID informationOutsideSend to the part tool side.
  Therefore, on the external tool side, based on the obtained rewrite order information, it is possible to instruct rewriting of data in an optimal order without fail.
[0025]
  (4) In the invention of claim 4, a first electronic control device including a plurality of microcomputers having a nonvolatile memory capable of electrically rewriting data, and data transmission / reception with the first electronic control device are possible. A data rewriting method for rewriting data in each nonvolatile memory with respect to a second electronic control unit including a microcomputer having a nonvolatile memory capable of electrically rewriting data, wherein the first Among the plurality of microcomputers of the electronic control unit, a predetermined representative microcomputer stores ID information for rewriting the data for identifying the representative microcomputer itself and another microcomputer in its predetermined storage area. ID information for rewriting the specified data is stored in advance, and the second electronic Stores the ID information for rewriting the data identifying the microcomputer control apparatus beforehand, the representative microcomputer, ThroughShin lineThroughconnectorConnected to the external toolElectrically connectedThe aboveIn response to a request from an external tool, for rewriting the data stored in advance in a predetermined storage area of the representative microcomputerIncluding the representative microcomputer itselfID information of all the microcomputers is transmitted to the external tool via the communication line, and the external tool that has received the ID information has the first electronic control unit determined based on the ID information and The rewrite data of the microcomputer to be rewritten by the second electronic control unit is transmitted to the first electronic control unit via the communication line, and the first electronic control unit transmits the rewrite target micro by the second electronic control unit. The microcomputer to be rewritten by the first electronic control unit, which has transmitted the rewrite data of the computer to the second electronic control unit and received the rewrite data from the external tool, uses the rewrite data to store its own nonvolatile memory. In addition to rewriting the data, the second electronic control unit that has received the rewrite data from the first electronic control unit is a microcomputer to be rewritten. Over data, using the rewrite data, and performs rewriting of the data in its nonvolatile memory.
[0026]
The present invention does not rewrite the data of the microcomputers in the same electronic control unit, but transmits / receives data between the different electronic control units and rewrites the data between the microcomputers in the different electronic control units. Is.
In other words, since there is no particular limitation on the ID information stored in the representative microcomputer, by storing the ID information of the microcomputer in the other electronic control device, it can be regarded as a microcomputer in the same electronic control device, Similarly, data can be rewritten.
[0027]
  (5) The invention of claim 5 has a non-volatile memory capable of electrically rewriting data, and executes a control process for controlling a predetermined control object in accordance with the data stored in the non-volatile memory. In the electronic control device capable of rewriting data of the microcomputer using rewrite data transmitted from an external tool, a predetermined representative microcomputer among the plurality of microcomputers In a predetermined storage area, ID information for rewriting the data specifying the representative microcomputer itself and ID information for rewriting the data specifying another microcomputer are stored in advance. Microcomputer, ThroughShin lineThroughconnectorConnected to the external toolElectrically connectedThe aboveIn response to a request from an external tool, for rewriting the data stored in advance in a predetermined storage area of the representative microcomputerIncluding the representative microcomputer itselfThe ID information of all the microcomputers is transmitted to the external tool via the communication line, and the representative microcomputer, the other microcomputer, and the external tool are on the same communication line. Connected configuration,
  Further, the ID information is used by the external tool to specify a microcomputer to which data is to be rewritten, and is specified and transmitted to the electronic control unit. The data of the corresponding microcomputer is rewritten based on the ID information, and the representative microcomputer functions as a device that representatively responds to the request of the external tool with the ID information. It is characterized by that.
[0028]
  In the present invention, the representative microcomputer stores ID information for rewriting data specifying the representative microcomputer and ID information for rewriting data specifying another microcomputer in its predetermined storage area. Pre-stored.
[0029]
  Therefore, the representative microcomputer is an electronic control unit and a communication line.And the connectorID information of all microcomputers for rewriting data stored in advance in a predetermined storage area of the representative microcomputer in response to a request from an external tool electrically connected via the communication line Can be sent to external tools.
[0030]
Therefore, on the external tool side, for example, necessary information such as the number of microcomputers for rewriting data can be obtained in the same electronic control unit. Based on this ID information, parameters necessary for data rewriting are obtained. The file can be determined.
[0031]
As a result, there is an effect that the labor of selecting the parameter file by referring to many materials corresponding to the parts to be rewritten as in the past can be greatly reduced.
In addition, since the parameter file is determined based on the ID information transmitted from the electronic control unit side, it is possible to effectively prevent a rewrite error without erroneously selecting the parameter file as in the past. Can do.
[0032]
  (6Claim6In the invention, the predetermined storage area is an area in which rewriting of data in the nonvolatile memory is prohibited.
  The present invention exemplifies a stored area where ID information is stored in a representative microcomputer. That is, if ID information is stored in an area where rewriting of data in the nonvolatile memory is prohibited, the ID information is not erased when data is rewritten.
[0033]
  It should be noted that ID information may be stored in another so-called ROM instead of an area where data rewriting of a nonvolatile memory (for example, flash memory) is prohibited.Yes.
[0036]
  (7Claim7In the present invention, the predetermined storage area of the representative microcomputer is actually rewritten in the writing mode when writing the data in addition to the ID information.MicrocomputerRewrite order information indicating the order is stored.
  In the present invention, rewrite order information in addition to ID informationAlsoI remember. Therefore, when there is a request from the external tool, the rewrite order information in addition to the ID information can be transmitted to the external tool side.
[0037]
Therefore, on the external tool side, based on the obtained rewrite order information, it is possible to instruct rewriting of data in an optimal order without fail.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Examples of embodiments of the data rewriting method and the electronic control device according to the present invention will be described below.
(Example)
Here, an in-vehicle electronic control device that can implement the data rewriting method of the present invention will be described as an example.
[0039]
a) First, the basic configuration of the present embodiment will be described with reference to FIG. FIG. 1 shows an electronic control unit (ECU) mounted on an automobile.
As shown in FIG. 1, for example, an automobile (vehicle) having a 6-cylinder engine has, for example, an electronic control device (engine ECU) 1 for controlling the engine and an electronic device for body control that controls a switch related to the vehicle body. Many ECUs such as a control device (body ECU) 3 are mounted.
[0040]
When rewriting data such as the control program and control data, the ECUs 1 and 3 connect the memory rewriting device 5 which is an external tool (CAN tool) and rewrite the data by a command from the memory rewriting device 5. Is done.
Among the ECUs 1 and 3, for example, the engine ECU 1 has a plurality of microcomputers 13 to 17 mounted on the motherboard 7 in addition to the connector 9 and the chip resistor 11.
[0041]
The microcomputers 13 to 17 are components equipped with a flash memory or the like that can electrically rewrite data, that is, a CPU with a built-in flash memory. In other words, the engine ECU 1 is equipped with three microcomputers, that is, a CPU 13 for engine control, a CPU 15 for electronic throttle control monitoring, and a CPU 17 for knock control as CPUs with built-in flash memory.
[0042]
b) Next, a configuration in which the memory rewriting device 5 is connected to the engine ECU 1 will be described with reference to FIGS. 2 is a block diagram showing the overall configuration of the engine ECU 1 and the like, and FIG. 3 is a schematic configuration diagram showing the main part thereof.
As shown in FIG. 2, the engine ECU 1 performs various controls on the engine 19, the engine control CPU 13, the electronic throttle control monitoring CPU 15, the knock control CPU 17, and their input / output circuits 21. ~ 25.
[0043]
Each of the CPUs 13 to 17 is configured in exactly the same manner (described here as the engine control CPU 13), and operates a microprocessor unit (MPU) 27 that operates according to a control program and the MPU 27. I / O for exchanging signals between the flash memory (EEPROM) 29 for storing necessary control programs and control data, the RAM 31 for temporarily storing calculation results of the MPU 27, and the input / output circuit 21. A port 33, a communication circuit 35 for performing serial data communication with the outside, and a bus 37 for connecting the above-described units are provided.
[0044]
Here, the memory area of the flash memory 29 is divided into a rewritable memory area 29a in which data can be rewritten and a non-rewritable memory area 29b in which data cannot be rewritten (or data rewriting is prohibited). ing.
A serial communication line 39 (connected to the communication line 35) extends from the engine ECU 1 to the outside.
[0045]
A connector 43 is attached to the tip of the serial communication line 39, and the engine ECU 1 is connected to the memory rewriting device 5 for rewriting an engine control program and data via the connector 43.
In the engine ECU 1 configured as described above, each of the CPUs 13 to 17 starts the boot program stored in the non-rewritable memory area 29b of the flash memory 29 immediately after the reset, and the memory rewriting device 5 is not normally connected. Sometimes, the boot program calls a program stored in the rewritable memory area 29a of the flash memory 29 to control the engine.
[0046]
In particular, in this embodiment, as shown in FIG. 3, the engine control CPU (rewrite target component A) 13, the electronic throttle control monitoring CPU (rewrite target component B) 15, and the knock control CPU (rewrite target). In part C) 17, $ 01, $ 02, and $ 03 are set as ID information for identifying itself, and the ID information is stored in the non-rewritable memory area 29b of each flash memory 29. ing.
[0047]
Among these, the engine control CPU 13 is set as a representative part of all the CPUs 13 to 17 housed in the same engine ECU 1, and all of the non-rewritable memory areas 29 b of the flash memory 29 of the engine control CPU 13 are included in the engine control CPU 13. ID information of the CPUs 13 to 17 is stored.
[0048]
c) Next, a parameter file used for rewriting the ID information and data will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a configuration necessary for rewriting data.
As shown in FIG. 4, in a certain vehicle (e.g., a six-cylinder engine vehicle), the ID information of all the CPUs 13 to 17 housed in the engine control CPU 13 is stored in the engine control CPU 13 which is the representative part A of the engine ECU 1. ($ 01, $ 02, $ 03) is stored.
[0049]
In another vehicle (for example, a four-cylinder engine vehicle), all (in this case, one CPU) ID information ($) is stored in the engine / knock control CPU 53 which is a representative part A ′ of the engine ECU 51. 01) is stored.
Each representative part stores not only the ID information but also the order of entering the writing mode (the entry order information), the order of actually writing the data (rewriting order information), etc. Has been.
[0050]
On the other hand, the memory rewriting device 5 stores a plurality of parameter files used when rewriting data. The parameter file is a file that stores various data such as the number of flash memories and memory size necessary for data rewriting.
[0051]
As this parameter file, the parameter file 1 for rewriting data of the CPUs 13 to 17 (parts A to C) of the engine ECU 1 in the six-cylinder engine and the data rewriting of the CPU 53 (part A ′) of the engine ECU 51 in the four-cylinder engine are used. A parameter file 2 for data rewriting, and a parameter file 3 for rewriting the data of the CPU of the engine ECU in a vehicle (not shown) other than the above can be considered. If the parameter file 2 and the parameter file 3 are the same, the parameter file 2 And the parameter file 3 can be shared.
[0052]
That is, in the present embodiment, parameter files having the same contents can be shared, so that parameter file 2 may be omitted and parameter file 1 and parameter file 3 may be stored.
Therefore, as described later, when $ 01, $ 02, and $ 03 are obtained as ID information, that is, when there are parts A to C as parts to be rewritten, the parameter file 1 is used, while $ ID is used as ID information. If there is only 01, that is, if there is a part A ′ or the like as a part to be rewritten, data is rewritten using the parameter file 3.
[0053]
  d) Next, a procedure for rewriting data using the parameter file will be described with reference to FIGS. 5 is a flowchart showing processing on the memory rewriting device side, and FIG. 6 is a flowchart showing processing on the ECU side.
  (1)Rewrite processing on the memory rewrite device 5 side (tool side processing)
On the memory rewriting device 5 side, first, in step 100 of FIG. 5, the ECU whose data is to be rewritten is selected. For example, when an operator selects an ECU to be rewritten from the type of ECU displayed on the display of the memory rewriting device 5 by a switch operation or the like, a signal indicating that the ECU has been selected is displayed in the memory rewriting device. 5 is input.
[0054]
In the subsequent step 110, an ID acquisition command is transmitted to the selected ECU. The ID acquisition command is a command for causing the selected ECU (and thus the CPU that is the representative component) to transmit all IDs stored in the CPU of the representative component to the memory rewriting device. .
[0055]
In order to determine which CPU is the representative part, the part with the smallest numerical value, such as the ID of $ 01, may be set as the representative part.
In the following step 120, all IDs transmitted from the CPU (for example, the engine control CPU 13) which is a representative part of the ECU are acquired in response to the ID acquisition command.
[0056]
By transmitting the ID acquisition command, not only the ID information but also the order of entering the writing mode and the order of actually writing data can be obtained from the engine ECU 1 side.
In the following step 130, a parameter file used for rewriting data is determined based on the acquired ID. For example, in the case of the engine ECU 1, $ 01, $ 02, and $ 03 are obtained as ID information, and accordingly, the parameter file 1 is determined to be used as the parameter file to be used.
[0057]
In the subsequent step 140, an ID is assigned to each part in the ECU to be rewritten (in-group part), and a write mode entry command for instructing entry into the write mode is entered into the write mode. Send sequentially according to the order. Thereby, according to the order which rushes into writing mode, each component rushes into writing mode sequentially.
[0058]
In the subsequent step 150, the ID of the part to be rewritten is added to the rewrite data and transmitted to the ECU side. Thus, the component corresponding to the ID receives the transmitted rewrite data and rewrites the data.
In subsequent step 160, it is determined whether or not the data rewriting has been completed for the component corresponding to the ID. If an affirmative determination is made here, the process proceeds to step 170, whereas if a negative determination is made, the process returns to step 150 and the same processing is repeated.
[0059]
  In step 170, it is determined whether or not the rewriting of all parts has been completed. If an affirmative determination is made here, the present processing is once terminated, whereas if a negative determination is made, the processing returns to step 150 and the same processing is repeated.
  (2)ECU side rewrite processing (ECU side processing)
On the ECU side, an ID acquisition command from the memory rewriting device 5 is received in step 200 of FIG.
[0060]
In the subsequent step 210, when the ID acquisition command is received, the IDs of all the CPUs stored in the flash memory are transmitted from the CPU (for example, the engine control CPU) which is the representative part.
At this time, not only the ID information but also the order of entering the writing mode and the order of actually writing the data are transmitted.
[0061]
In the subsequent step 220, the parts in the ECU to be rewritten (in-group parts) receive the write mode entry command and sequentially enter the write mode.
In the next step 230, the ECU side receives the ID information and its rewrite data in the write mode.
[0062]
In subsequent step 240, it is determined whether or not the transmitted data includes an ID addressed to the user. If an affirmative determination is made here, the process proceeds to step 250. If a negative determination is made, the process returns to step 230 and the same processing is repeated.
In step 250, the component data corresponding to the ID is rewritten.
[0063]
In the next step 260, it is determined whether or not rewriting of all parts is completed. If an affirmative determination is made here, the present process is temporarily terminated. On the other hand, if a negative determination is made, the process returns to step 230 to repeat the same process.
e) Next, the effect of the present embodiment will be described.
[0064]
In this embodiment, the engine control CPU 13 is designated as a representative part from among the plurality of CPUs 13 to 17 housed in the engine ECU 1, and the non-rewritable memory area 29 b of the flash memory 29 of the engine control CPU 13 is designated. Further, ID information ($ 01) for specifying the engine control CPU 13 itself and ID information ($ 02, $ 02) of the other electronic throttle control monitoring CPU 15 and knock control CPU 17 are stored.
[0065]
When the engine ECU 1 receives an ID acquisition command from the memory rewriting device 5, the ID information of all the CPUs 13 to 17 stored in the flash memory 29 is stored in the memory from the engine control CPU 13. It is transmitted to the rewriting device 5 side.
[0066]
Therefore, the memory rewriting device 5 can determine a parameter file necessary for rewriting data based on the received ID information. For example, when there are three CPUs 13 to 17 in the engine ECU 1 as in this time, it is possible to determine to use the parameter file 1 corresponding to the three memories.
[0067]
As a result, there is an effect that the labor of selecting the parameter file by referring to many materials corresponding to the parts to be rewritten as in the past can be greatly reduced.
Further, since the parameter file is determined based on the ID information transmitted from the engine ECU 1, the parameter file is not selected by mistake as in the prior art, and rewriting errors can be effectively prevented. it can.
[0068]
Furthermore, in this embodiment, the flash memory 29 of the engine control CPU 13 stores not only ID information but also rush order information indicating the order of microcomputers to be rushed into the writing mode and the actual state after rushing into the writing mode. And rewrite order information indicating the order of rewriting.
[0069]
Therefore, when obtaining the ID information, the memory rewriting device 5 can obtain not only the ID information but also the entry order information and the rewriting order information.
Therefore, based on the entry order information and the rewrite order information, the data can be reliably rewritten in an appropriate order.
[0070]
Needless to say, the present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the present invention.
(1) For example, only the ID information may be transmitted to the memory rewriting device, and the order in which the memory rewriting device enters the writing mode or the actual writing order may be determined.
[0071]
(2) Moreover, in the said Example, although the representative component was set to CPU in one ECU, you may set a representative component in CPU between some ECUs.
For example, the CPU of the representative part (for example, the CPU of the engine ECU) may be set between the CPU of the engine ECU and the CPU of the transmission ECU for transmission control.
[0072]
In this case, the CPU information of another ECU is also stored in the CPU of the representative part, and when the ID acquisition command is transmitted from the memory rewriting device connected to the engine ECU, the CPU of the engine ECU In addition to its own ID, the CPU ID of another ECU is transmitted.
[0073]
Therefore, when ID information and rewrite data are transmitted from the memory rewrite device, necessary communication is performed between the engine ECU and another ECU, and not only rewriting of the data of the engine ECU but also other ECUs The CPU data can be rewritten.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a vehicle including an electronic control device according to an embodiment.
FIG. 2 is a block diagram illustrating an electrical configuration of the electronic control device and the memory rewriting device according to the embodiment.
FIG. 3 is an explanatory diagram illustrating a main part of the electronic control device and the memory rewriting device according to the embodiment.
FIG. 4 is an explanatory diagram illustrating ID information, a parameter file, and the like in the embodiment.
FIG. 5 is a flowchart illustrating processing on the memory rewriting apparatus side of the embodiment.
FIG. 6 is a flowchart illustrating processing on the electronic control device side of the embodiment.
FIG. 7 is an explanatory diagram showing processing of a conventional technique.
FIG. 8 is an explanatory diagram showing a configuration of a conventional technique.
[Explanation of symbols]
1, 51 ... Engine ECU
3 ... Body ECU
5 ... Memory rewriting device (external tool: CAN tool)
13 ... Engine control CPU
15 ... CPU for electronic throttle control monitoring
17 ... Knock control CPU
29 ... Flash memory (flash EEPROM)
29a ... area
29b ... area

Claims (7)

In a data rewriting method for rewriting data in the nonvolatile memory for an electronic control device including a plurality of microcomputers having a nonvolatile memory capable of electrically rewriting data,
Among the plurality of microcomputers, a predetermined representative microcomputer has, in its predetermined storage area, ID information for rewriting the data specifying the representative microcomputer itself and the data specifying another microcomputer. ID information for rewriting is stored in advance,
The representative microcomputer is connected to the connector via the communication line, the connector is electrically connected to the external tool, a request from the external tool, stored in advance in a predetermined storage area of the representative microcomputer ID information of all microcomputers including the representative microcomputer itself for rewriting the data is transmitted to the external tool via the communication line,
The external tool that has received the ID information transmits the rewrite data of the microcomputer to be rewritten determined based on the ID information to the microcomputer to be rewritten via the communication line,
The microcomputer to be rewritten that has received the rewrite data transmitted from the external tool via the communication line rewrites data in its nonvolatile memory using the rewrite data. Data rewriting method.   When rewriting the data, the microcomputer to be rewritten out of the plurality of microcomputers having the nonvolatile memory enters a writing mode for writing the data according to an instruction from the external tool. The data rewriting method according to claim 1.   In response to a request from the external tool, the representative microcomputer is a microcomputer that actually rewrites after entering the write mode that is predetermined and stored in a predetermined storage area of the representative microcomputer in addition to the ID information. The data rewriting method according to claim 2, wherein rewriting order information indicating a computer order is transmitted to the external tool. A first electronic control device including a plurality of microcomputers having a nonvolatile memory capable of electrically rewriting data, data can be transmitted to and received from the first electronic control device, and data can be electrically rewritten A data rewriting method for rewriting data in each nonvolatile memory with respect to a second electronic control unit including a microcomputer having a nonvolatile memory,
Among the plurality of microcomputers of the first electronic control unit, a predetermined representative microcomputer has ID information for rewriting the data specifying the representative microcomputer itself and other information in a predetermined storage area of the first microcomputer. ID information for rewriting the data for specifying the microcomputer is stored in advance, and ID information for rewriting the data for specifying the microcomputer of the second electronic control unit is stored in advance. ,
The representative microcomputer is connected to the connector via the communication line, the connector is electrically connected to the external tool, a request from the external tool, stored in advance in a predetermined storage area of the representative microcomputer ID information of all microcomputers including the representative microcomputer itself for rewriting the data is transmitted to the external tool via the communication line,
The external tool that has received the ID information receives, via the communication line, rewrite data of the microcomputer to be rewritten by the first electronic control device and the second electronic control device determined based on the ID information. To the first electronic control unit,
The first electronic control unit transmits rewrite data of a microcomputer to be rewritten by the second electronic control unit to the second electronic control unit,
The microcomputer to be rewritten by the first electronic control unit that has received the rewrite data from the external tool rewrites the data in its nonvolatile memory using the rewrite data,
The data rewrite method is characterized in that the microcomputer to be rewritten by the second electronic control unit that has received the rewrite data from the first electronic control unit rewrites data in its nonvolatile memory using the rewritten data. Method. It has a non-volatile memory that can electrically rewrite data, and has a plurality of microcomputers that execute a control process for controlling a predetermined control object in accordance with the data stored in the non-volatile memory, and is transmitted from an external tool In the electronic control device capable of rewriting the microcomputer data using the rewritten data,
Among the plurality of microcomputers, a predetermined representative microcomputer has, in its predetermined storage area, ID information for rewriting the data specifying the representative microcomputer itself and the data specifying another microcomputer. ID information for rewriting is stored in advance,
The representative microcomputer is connected to the connector via the communication line, the connector is electrically connected to the external tool, a request from the external tool, stored in advance in a predetermined storage area of the representative microcomputer ID information of all the microcomputers including the representative microcomputer itself for rewriting the data is transmitted to the external tool via the communication line,
And the representative microcomputer, the other microcomputer, and the external tool are connected by the same communication line,
Further, the ID information is used by the external tool to specify a microcomputer to which data is to be rewritten, and is specified and transmitted to the electronic control unit. Rewriting processing of the data of the corresponding microcomputer is executed based on the ID information of
The representative microcomputer functions as a device that representatively responds to the request of the external tool for the ID information.   The electronic control apparatus according to claim 5, wherein the predetermined storage area is an area where rewriting of data in the nonvolatile memory is prohibited.   In the predetermined storage area of the representative microcomputer, in addition to the ID information, rewrite order information indicating the order of microcomputers to be actually rewritten in a writing mode when writing the data is stored. The electronic control device according to claim 5 or 6.

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