Electric unit e.g. bridge rectifier diode, defect detecting method for e.g. truck, involves comparing theoretical and effective intensities of current to identify defect when difference between intensities is greater than threshold value

摘要

The method involves comparing, in a control box (19) of an electromagnetic retarder, a theoretical intensity (It) of a current injected in primary coils (8) by the box and an effective intensity (Ie) of the current circulating in the coils for identifying a defect when difference between the intensities is greater than a threshold value. The comparison step includes the determination of the difference between the theoretical intensity and a minimum or maximum value of the effective intensity during a predetermined time interval. An independent claim is also included for an electromagnetic retarder.