Random hardware failure index obtaining method and device

Abstract

The invention provides a random hardware failure index acquisition method, computer equipment and a computer readable storage medium. The random hardware failure index obtaining method in the technical scheme of the invention comprises the steps of obtaining a minimum cut set violating a security target based on fault tree analysis; obtaining a first minimum cut set, wherein the first minimum cutset is a set of minimum cut sets of which the basic failure number of the minimum cut sets in the minimum cut set is greater than or equal to 2 and the basic failures occur at the same time; obtainingthe failure rate of each minimum cut set in the first minimum cut set, wherein the failure rate of the minimum cut set refers to the probability of simultaneous occurrence of all basic failures in the minimum cut set; and obtaining a random hardware failure index based on the failure rate of each minimum cut set in the first minimum cut set. According to the technical scheme, the accuracy of theobtained random hardware failure index is high, and the complexity of obtaining the random hardware failure index is low.

Description

technical field [0001] The present invention relates to the technical field of automobiles, and more specifically, to a method and device for acquiring random hardware failure indicators, computer equipment, and a computer-storage-readable storage medium. Background technique [0002] The road vehicle functional safety standard ISO26262 grades the safety of vehicle control systems according to the degree of hazard and risk, and is divided into four safety integrity levels from ASIL A to ASIL D, of which ASIL D is the highest level and has the highest safety requirements. Different safety integrity levels have different safety parameter requirements, and the main indicators include: single-point fault metric (SPFM, single-point fault metric) and latent fault metric (LFM, latent-fault metric) are used to measure the hardware architecture The rationality of the design; random hardware failure probability metric, also known as random hardware failure index (PMHF, probabilistic m...

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Problems solved by technology

[0006] However, there are certain problems with the above evaluation method: first, only the failure of the component failure mode itself and the failure of the safety mechanism or diagnosis mechanism imposed on it occurs simultaneously, resulting in a violation of the safety goal, and does not consider the multi-point failure in other cases ( For example: the failure mode A of component 1 and the failure mode B of component 2 occur at the same time), resulting in the random hardware failure index of multi-point failure obtained by the evaluation is smaller than the actual random hardware failure index of multi-point failure

This evaluation method uses the latent failure of the component failure mode itself as the random hardware failure index of multi-point failure. Although the calculation method is simplified, the random hardware failure index of multi-point failure obtained by this evaluation method is greater than the actual multi-point failure random hardware failure index. hardware failure indicator

In addition, this evaluation method has no way to evaluate the actual impact of multi-point failures on safety goals, so it is not conducive to the subsequent analysis based on multi-point failures to evaluate the overall design

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