The invention discloses an open circuit diagnosis system of a high-voltage direct current end of an electric driving system of an electric automobile. The system comprises a positive switch, a pre-charging switch, a pre-charging resistor, a negative switch, an open circuit voltage detection device and a battery management system, wherein the pre-charging switch is connected in series with the pre-charging resistor and then is connected in parallel to the two ends of the positive switch; the open circuit voltage detection device is arranged at the two ends of the negative switch in parallel for detecting voltage values at the two ends of the negative switch; the two ends of the positive switch are connected between a positive end of a high-voltage battery and a positive electrode of the high-voltage direct current end; the two ends of the negative switch are connected between the negative end of the high-voltage battery and the negative electrode of the high-voltage direct current end; the battery management system is used for controlling the on and off of the positive switch, the pre-charging switch and the negative switch and is communicated with the open circuit voltage detection device and an entire control system. In a high-voltage power-on flow, whether a direct current end is connected with an inverter can be safely and effectively detected according to change condition of voltage at the two ends of the negative switch before and after closing of the pre-charging switch.
Open circuit diagnosis system of high-voltage direct current end of electric driving system of electric automobile
2015-07-29
Patent
Elektronische Ressource
Englisch
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