Electric vehicle high-voltage distribution box safety management system and management method

Abstract

The invention discloses an electric vehicle high-voltage distribution box safety management system and a management method. The system comprises a main contactor contact anti-loosening monitoring ECUused for receiving a detection signal of a pressure sensor arranged on the main contactor and judging whether a connection contact surface of a high-voltage wire metal terminal and a contact is loosened or not or whether surface contact pre-tightening is uniform or not under the action of a bolt pre-tightening force in real time so as to send square wave signals with different duty ratios to a PDUsafety management ECU; the PDU safety management ECU is used for receiving a current signal of a current sensor, and when any high-voltage electric device works abnormally, the PDU safety managementECU sends a control signal to the corresponding high-voltage electric device to control the high-voltage electric device to be started or stopped; and the PDU safety management ECU sends a result to aVCU through a CAN communication message after receiving the square wave signal, and the VCU judges whether to disconnect the main contactor or not according to the running state of the vehicle. All signal control is realized by the PDU safety management ECU top layer design, time delay is not needed, and an additional relay is not needed.

Description

technical field [0001] The invention relates to the technical field of high-voltage power distribution boxes for electric vehicles, in particular to a safety management system and management method for high-voltage power distribution boxes for electric vehicles. Background technique [0002] Whether it is a design change of the pure electric vehicle electrical control system based on a traditional gasoline vehicle, or a new development of a pure electric vehicle control system, it is necessary to consider the control logic design between the new high-voltage electrical device and the vehicle controller. Research hotspots of high pressure control management. [0003] Due to the addition of vehicle controller (VCU), high-voltage safety management system (high-voltage control box), motor and motor controller (MCU), battery and battery management system (BMS), DC-DC converter, charger , electric air conditioners, electric heating and other electrical devices and electrical syst...

AI Technical Summary

Problems solved by technology

[0018] The above-mentioned control and management method of high-voltage electrical components of electric vehicles based on the VCU of the whole vehicle can only realize the logical control of power-on and power-off of high-voltage electrical components. , the VCU cannot learn about these sudden safety abnormal faults at all. Therefore, the existing high-voltage control management of electric vehicles cannot realize the centralized safety management function of the working process of high-voltage electrical devices

Images