Abnormality protection device for operation of electric vehicle

Abstract

The embodiment of the invention belongs to the field of new energy vehicles and discloses an abnormality protection device for the operation of an electric vehicle. The device comprises an inner sidevoltage detection module, an outer side voltage detection module, a judgment module and a control module; the inner side voltage detection module is used for detecting the voltage of the first end ofa main positive relay in the high-voltage loop of the electric vehicle and inputting the voltage of the first end of the main positive relay to the judgment module; the outer side voltage detection module is used for detecting and obtaining the voltage of the second end of the main positive relay and inputting the voltage of the second end of the main positive relay to the judgment module; the judgment module is used for outputting a switching-off indication signal to the control module after identifying that the abnormal switching off of the main positive relay according to the voltage of thefirst end of the main positive relay and the voltage of the second end of the main positive relay; and the control module is used for switching off the coil drive of the main positive relay accordingto the switching-off indication signal. Therefore, the situation that the relay is switched on again after being abnormally switched off is avoided, the safe operation of the whole vehicle is guaranteed, and the failure rate of the vehicle is reduced.

Description

technical field [0001] The embodiments of the present invention relate to the field of new energy vehicles, and in particular to an abnormality protection device during operation of an electric vehicle. Background technique [0002] With the increasing popularity of new energy vehicles such as electric vehicles, hybrid electric vehicles (HEV), and plug-in hybrid electric vehicles (PHEV), the safety of new energy vehicles has attracted more and more attention from the industry and users . The failure rate of high-voltage batteries and motor components on new energy vehicles has attracted more and more attention from customers. [0003] The failure rate of main components such as relays, fuses and motor controllers in the battery is too high, and the cost and time of after-sales processing are too long, causing more and more customer complaints. [0004] In the process of researching the existing technology, the inventor found that: in the existing control scheme, when the v...

AI Technical Summary

Problems solved by technology

During the operation of the whole vehicle, due to the abnormal power supply voltage of the relay and the vibration, the contacts are abnormally disconnected for a short time and then closed again, which will cause a huge inrush current and damage the relay, insurance and motor controller.

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