| 摘要 |
PROBLEM TO BE SOLVED: To provide a determination method and a determination device performing failure determination of a contactor rapidly.SOLUTION: At the end of high voltage power supply, a control signal for opening a positive side contactor is outputted, and on the basis of the subsequent degree of voltage drop of a load, presence or absence of welding of a precharge contactor and a positive side contactor is determined. A determination is made that the positive side contactor is welded if the voltage does not drop, and that the precharge contactor is welded if the degree of voltage drop is smaller than a predetermined value. Furthermore, at the time of starting high voltage power supply, a control signal for closing the precharge contactor is outputted, and presence or absence of welding of a negative side contactor is determined on the basis of the subsequent degree of voltage rise of the load.SELECTED DRAWING: Figure 4 |
