PROBLEM TO BE SOLVED: To suppress reduction in reliability of diagnostic information.SOLUTION: When a main microcomputer detects a vehicle abnormality by vehicle diagnostic processing, the main microcomputer stores diagnostic information in a volatile memory and transmits the diagnostic information to a sub microcomputer. The sub microcomputer receives the diagnostic information and stores the same in a volatile memory (time t2). When an abnormality occurs in a power supply voltage Vb1 supplied to the main microcomputer, a power supply voltage monitoring circuit changes a voltage status signal Sv to a voltage level indicating an abnormal state of the power supply voltage Vb1. Upon detecting the voltage status signal Sv, the main microcomputer stops operation, and the sub microcomputer stores voltage abnormality information in the volatile memory (time t2a). When an ignition switch is off, the main microcomputer does not perform self-shutoff processing, but the sub microcomputer writes the diagnostic information and the voltage abnormality information stored in the volatile memory into a writable non-volatile memory by the self-shutoff processing (time t3).SELECTED DRAWING: Figure 3

    【課題】診断情報の信頼性低下を抑制する。【解決手段】メインマイコンは車両診断処理により車両異常を検出すると、診断情報を揮発性メモリに記憶する共に、サブマイコンへ診断情報を送信する。サブマイコンは、診断情報を受信して揮発性メモリに記憶する(時刻t2)。メインマイコンに供給される電源電圧Vb1に異常が発生すると、電源電圧監視回路は電圧ステータス信号Svを電源電圧Vb1の異常状態を示す電圧レベルに変化させる。この電圧ステータス信号Svを検知して、メインマイコンは動作を停止し、サブマイコンは電圧異常情報を揮発性メモリに記憶する(時刻t2a)。イグニッションスイッチのオフ時、メインマイコンはセルフシャットオフ処理を行わない一方、サブマイコンは、セルフシャットオフ処理により、揮発性メモリに記憶されている診断情報及び電圧異常情報を書き込み可能な不揮発性メモリに書き込む(時刻t3)。【選択図】図3


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    Title :

    ELECTRONIC CONTROL UNIT FOR AUTOMOBILE


    Additional title:

    自動車用電子制御装置


    Contributors:
    CAI GANG (author) / ARAI TOSHINAKA (author) / AKUTSU MARIKO (author)

    Publication date :

    2018-08-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen / G06F ELECTRIC DIGITAL DATA PROCESSING , Elektrische digitale Datenverarbeitung / G11C Statische Speicher , STATIC STORES



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