Funkční bezpečnost vybraného systému silničního vozidla

Abstract

This thesis deals with the functional safety of road vehicles, especially the utilization of appropriate methods, procedures and models, in response to the new situation, coupled with the introduction of new standards. The thesis was focused on the design of appropriate procedures and the utilization of qualitative and quantitative reliability analysis of motor vehicles selected systems, which significantly affect the road safety. To verify the actual levels of selected reliability parameters of equipment the reliability tests program has been created. Selected procedures and tools for functional safety assessment, based on the principles of functional safety of electrical / electronic safety-related systems, as described in the standards EN 61508 and ISO 26262, have been chosen. Dissertation thesis consists of theoretical and experimental part, and is divided into seven chapters. In the theoretical part are clearly organized and evolved the basic principles used in the field of functional safety. The new procedure for the risk classification for road vehicles, which simplifies the process of risk assessment and allocation of safety integrity levels, has been created. Furthermore, the methods for qualitative and quantitative evaluation of functional safety have been selected, described and elaborated. All these methods are in accordance with the recommendations of ISO 26262. The practical part focuses on the application of the procedures and methods proposed in the theoretical part. These methods to the bus entrance door system and front headlight car have been applied. Each function of the bus entry doors and their failure modes using the appropriate methods and procedures have been identified in a qualitative assessment of reliability. The result is proposition of various measures to the risk reduction. The theoretical model of reliability of random hardware failures using the appropriate procedures in a quantitative assessment of reliability has been performed. The specific numerical values for the functional safety parameters, on the basis of the performed model have been calculated.