JP2011218922A - Control device for vehicle and method of rewriting program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for vehicle which copes with such a state that there coexist a plurality of types of external rewrite devices using different communication protocols.SOLUTION: The control device for vehicle for carrying out communication connection to a plurality of types of external rewrite devices using different communication protocols includes a storage device for storing control program, a control section that rewrites the control program in response to rewrite commands received from the external rewrite devices connected to local devices for communication. In the control device for vehicle, the control section distinguishes the types of the external write devices connected to the local devices for communication based on header information of the rewrite commands received each time the rewrite commands are received and performs rewriting according to the protocols.

Description

 The present invention relates to a vehicle control device and a program rewriting method.

  Patent Document 1 listed below discloses a technique capable of rewriting a control program stored in a vehicle control device such as an ECU (Electronic Control Unit) while the vehicle control device is mounted on the vehicle. Has been.

JP 2009-123226 A

 Conventionally, an external rewriting device (rewrite) for development has been used to rewrite the control program stored in the ECU. However, this rewrite for development has been used exclusively at the vehicle development site. However, in recent years, electronic control of automobiles has become complicated, and it has become impossible to ignore the outflow of program defects on the market, and the introduction of market rewrite has progressed so that rewriting can be performed even for control devices on the market. It's getting on.

 However, if development rewrite and market rewrite coexist in the near future, the communication protocol used in both rewrites may not always match, so the communication protocol on the ECU side does not always match. It is considered that it is necessary to perform discrimination (that is, discrimination of a rewritten model). In this regard, in the rewriting of the control program using only the technology of Patent Document 1 and the conventional development rewrite, only rewriting by a single communication protocol is considered, and the development rewrite and the market rewrite coexist. It cannot cope with such a situation.

   The present invention has been made in view of the above-described circumstances, and provides a vehicle control device and a program rewriting method that can cope with a situation in which a plurality of types of external rewriting devices using different communication protocols coexist. For the purpose.

In order to solve the above-described problems, the present invention provides a vehicle control device capable of communication connection with a plurality of types of external rewriting devices using different communication protocols as a first solution means for a vehicle control device. A storage unit that stores the control program, and a control unit that rewrites the control program in response to a rewrite command received from the external rewriting device that is communicatively connected to the own device. Each time a rewrite command is received, the model of the external rewrite device connected to the own device is determined based on header information of the received rewrite command.
According to such a vehicle control device, it is possible to determine the model of the external rewriting device connected to the own device even in a situation where a plurality of types of external rewriting devices using different communication protocols coexist. it can.

In the present invention, as the second solving means relating to the vehicle control device, in the first solving means, the storage unit stores a communication protocol corresponding to each of the plurality of types of external rewriting devices. The control unit uses the communication protocol corresponding to the model of the external rewriting device determined based on the header information of the rewriting command among the communication protocols stored in the storage unit. The communication program is communicated with an external rewriting device, and the control program is rewritten in accordance with the rewrite command.
According to such a vehicle control device, the model of the external rewriting device connected to the own device is determined, and communication with the external rewriting device and rewriting of the control program are performed using a communication protocol corresponding to the determined model. It can be carried out.

  On the other hand, in the present invention, as a first solving means related to the program rewriting method, by transmitting a rewrite command from any of a plurality of types of external rewriting devices using different communication protocols to the vehicle control device, A program rewriting method for rewriting a control program of a control device, wherein the vehicle control device is communicatively connected to its own device based on header information of the received rewrite command every time the rewrite command is received. A model of the external rewriting apparatus is determined.

  In the present invention, as the second solving means relating to the program rewriting method, in the first solving means, the vehicle control device stores a communication protocol corresponding to each of the plurality of types of external rewriting devices. Using the communication protocol corresponding to the model of the external rewriting device determined based on the header information of the rewriting command, and communicating with the external rewriting device connected to the own device and responding to the rewriting command. The control program is rewritten.

 According to the present invention, it is possible to provide a vehicle control device and a program rewriting method that can cope with a situation in which multiple types of external rewriting devices using different communication protocols coexist.

It is a block block diagram of ECU1 (control apparatus for vehicles) in this embodiment. It is a flowchart showing the command judgment process which CPU1d performs at the time of rewriting of a control program. An example of data contents of a rewrite command transmitted from development rewrite A and market rewrite B is shown. It is a flowchart showing the command determination process in a modification.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block configuration diagram of a vehicle control device (hereinafter referred to as ECU) 1 in the present embodiment. As shown in FIG. 1, the ECU 1 in this embodiment is an ECU that can be connected to and communicate with two types of external rewriting devices (development rewrite A and market rewrite B) that use different communication protocols. An I / F 1a, a ROM (Read Only Memory) 1b, a RAM (Random Access Memory) 1c, and a CPU (Central Processing Unit) 1d are incorporated.

 The communication I / F 1a is connected to the development rewrite A or the market rewrite B via a communication line (not shown), and realizes data communication between the development rewrite A or the market rewrite B and the ECU 1 under the control of the CPU 1d. Communication interface. Although FIG. 1 illustrates a state in which the development rewrite A is connected to the communication I / F 1a, a market rewrite B can be connected instead of the development rewrite A.

 The ROM 1b (storage unit) is a rewritable nonvolatile memory that stores in advance a control program for realizing the vehicle control function of the CPU 1d, a communication protocol corresponding to each of the development rewrite A and the market rewrite B, and the like. It is. The RAM 1c is a volatile working memory used as a temporary data storage destination when the CPU 1d executes various processes according to the control program.

 The CPU 1d (control unit) is a central processing unit that executes various processes necessary for vehicle control in accordance with a control program stored in the ROM 1b. The CPU 1d also has a function of rewriting the control program stored in the ROM 1b in response to a rewrite command received from the development rewrite A or the market rewrite B connected to the own apparatus (ECU 1). ing. Below, the rewriting function of the control program which this CPU1d has is demonstrated in detail, referring FIG.2 and FIG.3.

 FIG. 2 is a flowchart showing a command determination process executed by the CPU 1d when the control program is rewritten. As shown in FIG. 2, when the CPU 1d receives a rewrite command from the development rewrite A or the market rewrite B (which cannot be determined at this time) via the communication I / F 1a, The first byte of data is extracted as header information from the received rewrite command (step S1).

 FIG. 3 shows an example of the data contents of the rewrite command transmitted from the development rewrite A and the market rewrite B. As shown in FIG. 3, the first byte data of the rewrite command transmitted from the development rewrite A is “7B” or “7C”, while the first 1 of the rewrite command transmitted from the market rewrite B. The byte data is “7D” or “7E”. Accordingly, by confirming the data of the first byte of the received rewrite command, it is possible to determine the type of rewrite (development rewrite A or market rewrite B) connected to the ECU 1.

 Returning to FIG. 2, based on the data extracted in step S <b> 1, the CPU 1 d receives the received command from the development rewrite A (is the rewrite model communicably connected to its own device the development rewrite A)? It is determined whether or not (step S2). If “Yes” is determined in step S2, that is, if the CPU 1d determines that the development rewrite A is connected to the ECU 1, the CPU 1d uses the communication protocol corresponding to the development rewrite A to communicate with the development rewrite A. Communication (return of a response to the command, etc.) and a control program rewrite process corresponding to the rewrite command are executed (step S3).

 On the other hand, if “No” in step S2, the CPU 1d determines whether the received command is received from the market rewrite B based on the data extracted in step S1 (the model of the rewrite connected to the own device). Is a market rewrite B) (step S4). If “Yes” in step S4, that is, if it is determined that the market rewrite B is connected to the ECU 1, the CPU 1d communicates with the market rewrite B using a communication protocol corresponding to the market rewrite B ( A response to the command is returned, and a control program rewrite process is executed according to the rewrite command (step S5).

On the other hand, if “No” in step S4, that is, if the rewrite model connected to the own apparatus does not correspond to either the development rewrite A or the market rewrite B, the CPU 1d performs a rewrite process of the control program. The command determination process is terminated without performing it.
Note that the CPU 1d executes the above-described processes of steps S1 to S4 each time it receives a rewrite command via the communication I / F 1a.

 As described above, according to the ECU 1 in the present embodiment, since the model of the rewrite connected to the own device (communication protocol determination) can be performed, the development rewrite A and the market that use different communication protocols. It is possible to cope with a situation where the rewrite B for use coexists.

In addition, this invention is not limited to the said embodiment, The following modifications are mentioned.
(1) In the above embodiment, the description has been made on the assumption that two types of external rewriting devices (development rewrite A and market rewrite B) that use different communication protocols coexist. Without being limited thereto, the present invention can be applied even in a situation where three or more types of external rewriting apparatuses using different communication protocols coexist.

 FIG. 4 shows a case where, for example, a situation in which three types of external rewriting devices (development rewrite A, market rewrite B, and market rewrite C) using different communication protocols coexist is controlled by the CPU 1d. It is a flowchart showing the command judgment process performed at the time of rewriting. In FIG. 4, the same steps as those in FIG.

 As shown in FIG. 4, in a situation where development rewrite A, market rewrite B, and market rewrite C coexist, CPU 1d determines that the received command is from market rewrite C if “No” in step S4. It is determined whether or not it has been received (the rewrite model communicatively connected to its own device is the market rewrite C) (step S6).

 If “Yes” in step S6, that is, if it is determined that the market rewrite C is connected to the ECU 1, the CPU 1d communicates with the market rewrite C using a communication protocol corresponding to the market rewrite C ( A response to the command is returned, and a rewrite process of the control program according to the rewrite command is executed (step S7). On the other hand, in the case of “No” in step S6, that is, the CPU 1d performs the control when the rewrite model connected to its own apparatus does not correspond to any of the development rewrite A, the market rewrite B, and the market rewrite C. The command determination process is terminated without rewriting the program.

(2) In the above embodiment, it is determined in step S2 of FIG. 2 whether or not the received command is received from development rewrite A. In step S4, whether or not the received command is received from market rewrite B. However, the contents of these steps may be interchanged. That is, in step S2 of FIG. 2, it is determined whether or not the received command is received from the market rewrite B. In step S4, it is determined whether or not the received command is received from the development rewrite A. May be. Of course, in this case, the contents of steps S3 and S5 also need to be interchanged.

  Similarly, in the modified example (1), it is determined in step S2 of FIG. 4 whether or not the received command is received from the development rewrite A. In step S4, the received command is received from the market rewrite B. Although it is determined whether or not the received command is received from the market rewrite C in step S6, the contents of these steps may be interchanged.

  DESCRIPTION OF SYMBOLS 1 ... ECU (control apparatus for vehicles), 1a ... Communication I / F, 1b ... ROM, 1c ... RAM, 1d ... CPU, A ... Development rewrite (external rewrite device), B ... Market rewrite (external rewrite device)

Claims (4)

A vehicle control device capable of communication connection with multiple types of external rewriting devices using different communication protocols,
A storage unit for storing the control program;
A control unit that rewrites the control program in response to a rewrite command received from the external rewriting device that is connected to the device by communication,
Each time the control unit receives the rewrite command, the control unit determines a model of the external rewrite device connected to the own device based on header information of the received rewrite command. . The storage unit stores a communication protocol corresponding to each of the multiple types of external rewriting devices,
The control unit communicates with the own device using a communication protocol corresponding to a model of the external rewriting device determined based on header information of the rewriting command among communication protocols stored in the storage unit. The vehicle control device according to claim 1, wherein communication with a connected external rewriting device and rewriting of the control program according to the rewriting command are performed. A program rewriting method for rewriting a control program of the vehicle control device by transmitting a rewrite command from any of a plurality of types of external rewrite devices using different communication protocols to the vehicle control device,
Each time the vehicular control device receives the rewrite command, the vehicular control device determines a model of the external rewrite device connected to the own device based on header information of the received rewrite command. Method.   The vehicle control device stores a communication protocol corresponding to each of the plurality of types of external rewriting devices, and the communication protocol corresponding to the type of the external rewriting device determined based on header information of the rewriting command. 4. The program rewriting method according to claim 3, wherein communication with an external rewriting device that is communicatively connected to the own device and rewriting of the control program according to the rewriting command are performed.

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