Reliability analysis method for high-voltage electrical system of pure electric commercial vehicle

A high-voltage electrical and analytical method technology, applied in electrical components, information technology support systems, systems based on fuzzy logic, etc., can solve the problem of unknown probability of events at the bottom of the sub-fault tree, incomplete evaluation of reliability, and inability to describe state degradation well Mode top event probability and other issues to achieve the effect of saving fault diagnosis time

Pending Publication Date: 2022-01-21
GUILIN UNIV OF ELECTRONIC TECH +1
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  • Abstract
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Problems solved by technology

[0005] However, it is difficult to solve the problem of uncertain probability of occurrence of top event and bottom event by traditional fault tree quantitative analysis method; in the traditional fault tree only includes two states of normal and failure, but in the actual working process of the system, Some components do not go directly from the normal state to the failure state but go through a period of degradation process. It is not comprehensive to use the two-state system to evaluate the reliability; for the state degradation mode sub-fault tree bottom event probability is often unknown, Can not describe the top event probability of state degradation mode well

Method used

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  • Reliability analysis method for high-voltage electrical system of pure electric commercial vehicle
  • Reliability analysis method for high-voltage electrical system of pure electric commercial vehicle
  • Reliability analysis method for high-voltage electrical system of pure electric commercial vehicle

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Embodiment 1

[0038] Refer figure 1 For the first embodiment of the present invention, this embodiment provides a high-voltage electrical system reliability analysis method of pure electric vehicle, including:

[0039] S1: Divide the pure electric vehicle high voltage electrical system into three subsystems of high pressure power battery systems, high voltage harness systems, and high-voltage drive motor systems, respectively establish a fuzzy fault tree for each subsystem.

[0040]In this example, the establishment of the polymorphic fault tree is taken as an example of the pure electric vehicle high voltage harness system. First, according to the high voltage harness system, it is divided into functional failure mode and state deterioration mode. For functional failure mode failure, it can include Mechanical damage, main insulation failure, fails, conductor connection failure, stress cone failure, overheating failure, protector failure, and then analyze the failure of these faults until the b...

Embodiment 2

[0074] In order to verify the technical effects used in the method, the present embodiment selects a conventional fault tree quantitative analysis method and a comparison test using the method to verify the true effect of the method.

[0075] The quantitative analysis method of traditional fault trees is difficult to ask for uncertain problems with the probability of decnation events and base events, and the fault diagnosis is longer.

[0076] To verify that the method can troubleshoot the system faster than the conventional fault tree quantitative analysis method. In this embodiment, the conventional fault tree quantitative analysis method and the method are used to perform real-time fault analysis of the pure electric vehicle high voltage line beam system, respectively. The time consumed by the two methods, and the time spent on the method of failure analysis of the method is saved 1 / 3 compared to the conventional fault tree quantitative analysis method.

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Abstract

The invention discloses a reliability analysis method for a high-voltage electrical system of a pure electric commercial vehicle. The method comprises the following steps: dividing the high-voltage electrical system of the pure electric commercial vehicle into three subsystems, and building a fuzzy fault tree for each subsystem; dividing each fuzzy fault tree into a function failure mode sub-fault tree and a state degradation mode sub-fault tree; solving the failure probability of the function failure mode sub-fault tree and the importance degree of bottom events according to a fuzzy probability of each bottom event by utilizing a fuzzy mathematical theory and a triangular fuzzy operator; obtaining the fuzzy probability through linguistic variables, and processing the fuzzy probability to obtain a probability when a polymorphic bottom event is in a failure state; solving a failure probability of the state degradation mode sub-fault tree, and combining the failure probability of the function failure mode sub-fault tree and the failure probability of the state degradation mode sub-fault tree to obtain the reliability of each subsystem. According to the invention, the fault diagnosis time is saved, and theoretical guidance is provided for reliability design of a high-voltage electrical system of a pure electric commercial vehicle.

Description

Technical field [0001] The present invention relates to the technical field of electrical system reliability analysis, and more particularly to a reliability analysis method of high voltage electrical system for pure electric vehicle. Background technique [0002] In recent years, the fault tree analysis method is to analyze all the reasons why the system failure can be analyzed. The importance of probability and bottom incident, currently based on fault tree method is mature, and various reliability analysis software is constantly improving. [0003] Fuzzy fault tree analysis is a way to solve the probability uncertainty of the fault tree analysis by fuzzy probability; The probability of events, and finally obtain the system's reliability, and the fuzzy probability of the bottom event. [0004] If a component in the system is degraded, it may cause degradation of the system status, resulting in multiple states, ie the polymorphism system; polymorphism system theory provides a ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06N7/02G06N7/00G06F119/02G06F119/04
CPCG06F30/20G06N7/02G06F2119/02G06F2119/04G06N7/01Y04S10/50
Inventor 郑伟光姜浩楠许恩永何水龙唐荣江
Owner GUILIN UNIV OF ELECTRONIC TECH
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