LOAD DRIVING CIRCUIT ABNORMALITY MONITORING DEVICE AND METHOD THEREFOR

摘要

An ECU executes a program which includes a step (S120) where a VB estimate value is calculated when a DC/DC converter is boosting (YES at S110), a step (S140) where a VB sensor is judged temporarily abnormal when a status where an absolute value of a difference between the VB estimate value and a VB value detected by the VB sensor is at a voltage threshold value X or higher continues for a previously fixed time (YES at S130), a step (S160) where the VH sensor is judged temporarily abnormal when a status where an absolute value of a difference between the VH voltage command value and a VH value detected by the VH sensor is at a voltage threshold value Z or higher continues for a previously fixed time (YES at S150), a step where boosting is stopped and an abnormal sensor is specified based on deviations from the VB value and the VH value when the sensor is judged temporarily abnormal (NO at S100) and that the converter is not boosting (NO at S110), and steps (S200-S250) where an abnormal sensor is specified based on the deviations from the VB value and the VH value and tolerance of each sensor.