PROBLEM TO BE SOLVED: To diagnose, by a FET short circuit detection unit, a short circuit failure of an inverter FET to appropriately take a countermeasure to a diagnosis result, without increasing a cost.SOLUTION: An electronic controller comprises: a reverse-connection protection FET; a diagnosis resistance voltage dividing circuit 120 that receives power supply and divides each connection point voltage of upper and lower stage FETs to output divided voltage; a FET short circuit detection unit 110 that receives power supply and, on the basis of the divided voltage, detects at least one of the upper and lower stage FETs to output an error notification; and a detection unit failure diagnosis function that receives input of the error notification, is incorporated in a MCU, and detects a failure of the FET short circuit detection unit. The detection unit failure diagnosis function performs a failure diagnosis on the FET short circuit detection unit 110 at the time of start-up and turns off the upper and lower stage FETs when a failure at the FET short circuit detection unit 110 is detected; when no failure at the FET short circuit detection unit 110 is detected, the FET short circuit detection unit 110 performs a short circuit failure diagnosis on the upper and lower stage FETs.SELECTED DRAWING: Figure 7
【課題】コストアップすることなく、FETショート検出部によりインバータFETのショート故障を診断し、診断結果に適正に対応する。【解決手段】逆接保護用FETと、電源を供給され、上下段FETの各接続点電圧を分圧して分圧電圧を出力する診断用抵抗分圧回路120と、電源を供給され、分圧電圧に基づき、上下段FETの少なくとも一方のショート故障を検出し、エラー通知を出力するFETショート検出部110と、エラー通知を入力すると共に、MCUに内臓されており、FETショート検出部の故障を検出する検出部故障診断機能とを備えており、検出部故障診断機能は、起動時にFETショート検出部110の故障を診断し、FETショート検出部110の故障が検出された時は、上下段FETをOFFし、FETショート検出部110の故障が検出されない場合には、FETショート検出部110は、上下段FETのショート故障を診断する。【選択図】図7
ELECTRONIC CONTROLLER AND ELECTRIC POWER STEERING DEVICE MOUNTING THE SAME
電子制御装置及びそれを搭載した電動パワーステアリング装置
2018-07-19
Patent
Electronic Resource
Japanese
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