Reliability evaluation method for vehicle-mounted composite power supply based on Markov chain and Bayesian network

Abstract

The invention discloses a reliability evaluation method for a vehicle-mounted composite power supply based on a Markov chain and a Bayesian network. Firstly, based on the Markov chain theory, established are state transition diagrams when four different topological structural composite power supplies of a cascaded structural composite power supply with a supercapacitor located at an intermediate position, a cascaded structural composite power supply with a storage battery at the intermediate position, a parallel structural composite power supply and a multi-input power converter structural composite power supply break down; secondly, according to the state transition diagrams when the four different topological structural composite power systems break down, a Bayesian network model diagram, which eventually causes failure of the composite power supply, resulting in the system in a paralyzed state, is established based on the Bayesian network theory; finally, according to the established Bayesian network model diagram, the failure rates of the four different topological structural composite power supplies are obtained by calculation, comparative analysis is carried out, and reliability evaluation is further carried out to obtain the composite power supply with the strongest reliability, thereby avoiding trial and error in engineering practice.

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 Bayesian network. 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 hybr...

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Problems solved by technology

However, little research has been done on HESS reliability assessment

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