High voltage interlock monitoring system of vehicular hybrid power battery

Abstract

The invention provides a high voltage interlock monitoring system of a vehicular hybrid power battery. The high voltage interlock monitoring system of the vehicular hybrid power battery is characterized by comprising a single chip microcomputer, an HVIL (high voltage interlock loop) monitoring circuit, a terminal resistor R, a battery pack interior high voltage interlock switch K1, a motor controller high voltage interlock switch K2, a vehicular controller high voltage interlock switch K3 and an oil pump controller high voltage interlock switch K4. The single chip microcomputer is bi-directionally connected with the HVIL monitoring circuit, a computer monitoring layer and a communication network layer. The output end of the HVIL monitoring circuit is connected with the terminal resistor, and the input end of the HVIL monitoring circuit is connected with the battery pack interior high voltage interlock switch K1. The motor controller high voltage interlock switch K2 is serially connected between the terminal resistor R and the battery pack interior high voltage interlock switch K1. A loop is formed by the vehicular controller high voltage interlock switch K3 and the oil pump controller high voltage interlock switch K4. The high voltage interlock monitoring system of the vehicular hybrid power battery has the advantages that anti-interference of the high voltage interlock monitoring system can be improved effectively, and reliability in high voltage safety monitoring of a vehicular is enhanced.

Description

technical field [0001] The invention relates to a high-voltage interlocking monitoring system of a hybrid power battery for automobiles. Background technique [0002] In recent years, with the rapid development of new energy vehicles, the research on the safety performance of new energy vehicles has attracted more and more attention, and the safety performance of new energy vehicles is getting closer and closer to that of traditional vehicles. The structure of a hybrid electric vehicle (HEV) is different from that of a traditional car, so the safety of a hybrid electric vehicle (HEV) is obviously different from that of a traditional car. The safety of a hybrid electric vehicle (HEV) mainly includes three aspects: structural safety, High pressure safe and chemical safe. The design of HEV vehicles must meet the requirements of GB / T19751-2005 "Safety Requirements for Hybrid Electric Vehicles" and GB / T18384 "Safety Requirements for Electric Vehicles". At present, the high-volt...

AI Technical Summary

Problems solved by technology

[0003] The traditional HVIL monitoring circuit is a single-channel signal transmission to monitor the high-voltage interlock switch of the vehicle. Usually, a pulse signal is output from the IO port of the microcontroller, which is amplified by the drive circuit and connected in series with the external high-voltage interlock switch. Finally, the output pulse signal is fed back to the microcontroller. In the process, the state of the high-voltage interlock switch and the fault information are judged by the single-chip microcomputer; since the whole vehicle environment is a nonlinear and strongly coupled environment, the noise is large, and the common-mode interference signal is strong. There are many external switches and long transmission lines, which are very susceptible to signal distortion caused by common-mode interference. When such distorted signals are fed back to the microcontroller, it is easy to cause misjudgment and mishandling of the microcontroller, which brings great harm to the reliability of high-voltage safety detection. serious hidden danger

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