PROBLEM TO BE SOLVED: To provide a rewrite system that suppresses a program rewrite time from being extended, while suppressing an increase in the storage capacity of nonvolatile memory.SOLUTION: An ECU transmits a write complete notification to a rewrite device each time an application is written to a small block. The rewrite device updates a write complete address that indicates the address of the small block at which write of application is completed, each time the write complete notification is received. When it is determined that rewrite of application has failed in the middle, the rewrite device sets the address of the small bock at which the write has failed to a start address on the basis of the write complete address. When a rewrite process restarts, the ECU saves, to the storage unit of the ECU, the stored content of a small block, of a large block that includes the start address, rewrite to which block is completed. The ECU then erases the stored content of the large block that includes the start address, and writes the stored content having been saved to the storage unit, to the large block.SELECTED DRAWING: Figure 3

    【課題】不揮発性メモリの記憶容量が増大するのを抑制しつつ、プログラムを書き換える時間が長くなるのを抑制する書換システムを提供する。【解決手段】ECUは、小ブロックにアプリケーションを書き込む度に書換装置へ書込完了通知を送信する。書換装置は、アプリケーションの書き込みが完了した小ブロックのアドレスを示す書込完了アドレスを書込完了通知を受信する度に更新する。書換装置は、アプリケーションの書き換えが途中で失敗したと判定した場合、書込完了アドレスに基づき、書き込みが失敗した小ブロックのアドレスを開始アドレスに設定する。書換処理が再開すると、ECUは、開始アドレスを含む大ブロックのうちの書き換えが完了している小ブロックの記憶内容を、ECUの記憶部に退避する。そして、ECUは、開始アドレスを含む大ブロックの記憶内容を消去し、記憶部に退避した記憶内容を大ブロックに書き込む。【選択図】図3


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    Title :

    REWRITE SYSTEM


    Additional title:

    書換システム


    Contributors:

    Publication date :

    2017-06-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G06F ELECTRIC DIGITAL DATA PROCESSING , Elektrische digitale Datenverarbeitung / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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