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

Abstract

The invention proposes a fault detection device and method for an electric vehicle and its high-voltage interlock system, wherein the high-voltage interlock system includes a high-voltage connector, the public end of the high-voltage connector has a first contact and a second contact, and the high-voltage connector has a first contact and a second contact. The female end of the plug-in has a third contact and a fourth contact, the first contact is matched with the third contact, the second contact is matched with the fourth contact, and the device includes: a voltage dividing unit, a first signal acquisition Terminal and the second signal acquisition terminal and the control unit, the control unit collects the voltage of the first signal acquisition terminal and the second signal acquisition terminal respectively to generate the first voltage value and the second voltage value, and according to the first voltage value and the second voltage value Judging the connection state of the high-voltage connector can effectively detect the abnormal connection fault of the high-voltage connector, provide a strong guarantee for the subsequent formulation of refined fault handling measures, and improve the driving experience of the driver.

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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