Patent ID: 8688317
Filing Date: 2014-04-01
Classification: G01R

Abstract:
1. A method for diagnosing an operating state of a device for disconnection and connection of a bipolar high-voltage battery of accumulators from/to a bipolar onboard power network of an automobile vehicle, the device including a first power relay installed between a first terminal of the battery and a first terminal of the power network, a second power relay installed between a second terminal of the battery and a second terminal of the onboard power network, and a serial connection of a third pre-charging relay and a pre-charging resistor, connected in parallel with the first power relay, the method comprising: measuring first and second voltages on the disconnection and connection device using first and second voltage measurement devices, respectively; comparing, using a controller, the first and second measured voltages with predetermined values of voltage representative of faults in the disconnection and connection device; and diagnosing, using the controller, a fault in any of the first power relay, the second power relay and the third pre-charging relay, depending on a result of said comparing, wherein the first and second measured voltages are a first voltage between the first terminal of the battery and a first terminal of the second power relay on a side of the onboard power network and a second voltage between the first and second terminals of the onboard power network, respectively.