Fault detecting device and method for electric vehicle and high-voltage interlocking system thereof

Abstract

The invention provides a fault detecting device and method for an electric vehicle and a high-voltage interlocking system thereof. The high-voltage interlocking system comprises a high-voltage connecting plug-in member, a male end of the high-voltage connecting plug-in member is provided with a first contact and a second contact, a female end of the high-voltage connecting plug-in member is provided with a third contact and a fourth contact, the first contact cooperates with the third contact, the second contact cooperates with the fourth contact, the device comprises a voltage dividing unit,a first signal collecting end, a second signal collecting end and a control unit, the control unit respectively collects voltages of the first signal collecting end and the second signal collecting end to generate a first voltage value and a second voltage value, according to the first voltage value and the second voltage value, a connection status of the high-voltage connecting plug-in member isjudged, thereby effectively detecting the abnormal connection of the high-voltage connecting plug-in member, a strong guarantee for the subsequent development of refined fault handling measures is provided, and the driving experience of a driver is improved.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a fault detection device and method for an electric vehicle and a high-voltage interlocking system thereof. Background technique [0002] In the face of increasingly severe energy and environmental problems, energy-saving and new energy vehicles are becoming research hotspots in various countries. As a kind of energy-saving and new energy vehicle, pure electric vehicle adopts all-electric drive, and its only energy source in the process of driving is the on-board power battery. All pure electric vehicles adopt a high-voltage drive scheme, that is, under normal conditions, the output voltage of the power battery reaches 400V or even higher. In addition, due to the collection of many high-voltage components inside pure electric vehicles, such as power batteries, drive motors, motor controllers, electric air conditioners, and chargers, the operating current of electric vehicles ca...

AI Technical Summary

Problems solved by technology

However, the problem with the related technology is that it can only realize faults such as connection and disconnection of the high-voltage plug-in, short-circuit to the power supply and short-circuit to the ground, and cannot realize the self-test of the high-voltage interlocking connector during the low-voltage power-on stage of the vehicle. Virtual connection detection and accurate connection status detection of connectors

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