To provide a failure diagnosis device performing failure diagnosis of an electromagnetic load circuit accurately.SOLUTION: In an electromagnetic load drive circuit 300, voltage in the upstream of an electromagnetic load 20 is monitored in a state where the diagnostic timing is high, the numbers of times above and below a predetermined threshold voltage are counted, the count number of 2 is normal, and the count number lower than 2 is a state where a high side switch element 16 for opening the valve of the electromagnetic load failed during chopping drive. Voltage in the upstream of the electromagnetic load is monitored, and short circuit failure state is detected when the voltage goes above the predetermined threshold voltage, and open-circuit failure state is detected when the voltage goes below the predetermined threshold voltage.SELECTED DRAWING: Figure 1
【課題】電磁負荷回路の故障診断を的確に行う故障診断装置を提供する。【解決手段】電磁負荷駆動回路300において、診断タイミングがハイの状態において、電磁負荷20上流の電圧をモニタし、所定の閾電圧を上回る回数と下回る回数をカウントし、カウント数が2回であれば正常であり、カウント数が2回より低い場合を、電磁負荷の開弁するためのハイサイドスイッチ素子16がチョッピング駆動中に故障した状態として、電時負荷上流の電圧をモニタし、所定の閾電圧を上回った場合を短絡故障状態、所定の閾電圧を下回った場合を開放故障状態、と検出する。【選択図】図1
ELECTROMAGNETIC LOAD DRIVE CIRCUIT
電磁負荷駆動回路
2018-12-27
Patent
Electronic Resource
Japanese
IPC: | H03K PULSE TECHNIQUE , Impulstechnik / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / F02M Zuführen von Brennstoff-Luft-Gemischen oder deren Bestandteilen bei Brennkraftmaschinen allgemein , SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES |