Vehicle-mounted composite power supply reliability evaluation method based on Markov chain and fault tree

Abstract

The invention discloses a vehicle-mounted composite power supply reliability evaluation method based on Markov chain and fault tree, comprising the following steps of: firstly, establishing a state transition graph when composite power supplies with four different topology structures comprising a cascaded structure composite power supply with a super capacitor located in an intermediate position,a cascaded structure composite power supply with a storage battery located in the intermediate position, a parallel connection structure composite power supply and a multi-input power converter structure composite power supply break down based on Markov chain theory; secondly, according to the state transition graph when the composite power supplies with four different topology structures break down, establishing a fault tree model graph which finally makes the composite power supply break down and the system be in a state of paralysis based on the fault tree theory; finally, according to theestablished fault tree model graph, calculating break down rate of the composite power supplies with four different topology structures, performing comparative analysis, and performing reliability evaluation, so as to obtain a composite power supply with the strongest reliability, and repeated tests in engineering practice are avoided.

Description

technical field [0001] The invention relates to a method for evaluating the reliability of a vehicle-mounted battery and a supercapacitor composite power supply, in particular to a method for evaluating the reliability of a vehicle-mounted composite power supply based on a Markov chain (hereinafter referred to as "Markov chain") and a fault tree. Background technique [0002] Traditional internal combustion engines account for the vast majority of current oil consumption, bringing about a series of problems such as air pollution, greenhouse gas emissions, and global warming. Pure electric vehicles are the inevitable trend of future automobile development. As the basic energy facilities of pure electric vehicles, vehicle electrification has attracted extensive attention from scholars at home and abroad. [0003] Hybrid electric vehicles are the first step towards the globalization of pure electric vehicles. Energy storage components are one of the key components of hybrid ele...

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Problems solved by technology

[0005] In order to solve the problem that the reliability of vehicle-mounted composite power supply is difficult to be accurately evaluated, the present invention provides a method for evaluating the reliability of vehicle-mounted composite power supply based on Markov chain and fault tree. The method is based on the combination of Markov chain theory and fault tree theory, and establishes Reliability model diagrams of composite power supplies with four different topologies for reliability evaluation

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