ZANESLJIVOST ELEKTRONSKIH KOMPONENT TRETJE ZAVORNE AVTOMOBILSKE LUČI skladno s STANDARDom SIEMENS SN 29500

MEHLE, MATEJ (author), Begeš, Gaber (mentor)

V diplomskem delu obravnavamo zanesljivost elektronskega dela tretje zavorne svetilke na osnovi zanesljivosti posameznih komponent elektronike. Obravnavani sistem komponent ima funkcijo avtomobilske tretje zavorne svetilke, ki je z vidika varnosti v cestnem prometu zelo pomembna, zatorej je njena zanesljivost še toliko nujnejša. Ker so zahteve po zanesljivosti produkta v času uporabe izražene že v času razvoja, ko še ni realnih podatkov iz baze uporabnikov in rezultatov testiranj, je treba zanesljivost izračunati z uporabo enega od veljavnih standardov, ki predpisujejo ustrezne enačbe in korekcijske pogoje. V uvodnem poglavju je na kratko predstavljen pomen zanesljivosti v elektroniki in kateri standardi se uporabljajo za njen izračun. Predstavljena sta tudi pomen okoljskih pogojev uporabljenega standarda Siemens SN 29500, ki so povzeti po standardu IEC 60721-3-1, in simulacijsko orodje, na podlagi katerega so pridobljene vrednosti napetosti, toka in moči, ki so potrebne za izračun stopnje odpovedi. Sledi drugo poglavje, v katerem so predstavljeni funkcija zanesljivosti in z njo povezani časovni pojmi. V tem poglavju najdemo potek stopnje odpovedi skozi življenjsko dobo komponente in opis njenih obdobij. Pomembno je predvsem drugo obdobje, to je obdobje normalne uporabe, kjer je predvidena konstantna stopnja odpovedi in ko veljajo izračuni zanesljivosti obravnavanega sistema. V tretjem poglavju so predstavljene nekatere glavne metode predvidevanja stopnje odpovedi komponent, čemur sledi podrobna predstavitev uporabljenega standarda SN 29500 ter vplivnih faktorjev odpovedi, ki jih standard zajema v izračunih. Četrto poglavje opisuje kosovnico elektronskega sistema tretje zavorne svetilke. Zajema tudi zahteve delovanja oziroma predvidene obremenitve celotnega sistema in tudi posameznih komponent. Izpostavljen je faktor obremenitve, ki je pri izračunu stopnje odpovedi komponent tretje zavorne svetilke nadvse pomemben, saj ta ni konstantno obremenjena, ampak le v primeru zaviranja avtomobila. V naslednjem, petem poglavju so podrobni izračuni stopnje odpovedi posameznih komponent sistema z upoštevanjem vplivnih oziroma odvisnih faktorjev. Z izračuni je narejena korekcija z referenčnih vrednosti, ki jih predpisuje standard, na dejanske, pri katerih so upoštevane obremenitve in razmere iz četrtega poglavja. V šestem poglavju je predstavljena razlika med serijsko in paralelno vezavo komponent. Z uporabo tabel in grafov so prikazani prispevki stopnje odpovedi posameznih komponent in celotnega vezja. Prikazani so izračuni časa med odpovedmi in zanesljivosti elektronskega sistema, za katerega so bile upoštevane enačbe sistema serijske vezave komponent. V zaključnem, sedmem poglavju pa sledijo sklepne ugotovitve in subjektivno mnenje o uporabljenem standardu ter izračunu zanesljivosti komponent.

• Language: Slovenian
• Keywords: zanesljivost, Siemens SN29500, IEC 60721-3-1, stopnja odpovedi, življenjska doba
• Work type: Bachelor thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-96200
• Publication date in RUL: 26.09.2017

Secondary language

• Language: English
• Title: RELIABILITY OF THIRD BRAKING LIGHT'S ELECTRONIC COMPONENTS according to THE STANDARD SIEMENS SN 29500

Abstract

In this thesis, we examine the reliability of the electronic part of the third brake light, based on the reliability of individual electronic components on the electronic circuit. The component system has the function of the automotive third brake light, which is very important in terms of road safety and so is its reliability. Since the requirements for the reliability of the product at the time of use are already defined at the time of development, when there are no real data from the user database and test results, the reliability should be calculated with applying one of the applicable standards that determine the appropriate equations and correction conditions. The introductory chapter briefly outlines the importance of reliability in electronics and which standards are used to calculate it. The significance of environmental conditions is also presented in the Siemens SN 29500 standard used, which is summarized in accordance with IEC 60721-3-1, and simulation tool, based on which the values of voltage, current and power are obtained and are necessary for calculating the rate of failure. In the next chapter the reliability function and related time concepts are presented. In this chapter, we find the degree of failure rate over component lifetime and description of its periods. Above all, the second period is important, that is the period of normal use, where a constant failure rate is predicted and when the considered system reliability calculations apply. In the third chapter, some of the main methods for predicting component failure rates are outlined, following a detailed presentation of the used SN 29500 standard and failure rate influence factors, which are covered by calculations in the standard. The fourth chapter describes the bill of material of electronic circuit of the third brake light. It also covers the operation requirements or the anticipated load on the entire system as well as individual components. The load factor is highlighted, which is extremely important when calculating the failure rate of components of the third brake light, as it is not constantly loaded, but only in the event of a car braking. In the next, chapter five, are detailed calculations of the failure rate degree of individual system components with respect to influential or dependent factors. With calculations, correction from the reference values prescribed by the standard are made to the actual ones, taking into account the loads and the conditions in the fourth chapter. The sixth chapter outlines the difference between serial and parallel circuit. The use of tables and graphs shows the contribution failure rates of individual components and of the entire electronic circuit. Calculated times between failures and reliability of electronic system are displayed, for which the equations of the serial circuit were taken into account. In the last, seventh chapter, we address the conclusions and the subjective opinion on the standard used and the calculation of the reliability of the components.

• Keywords: Reliability, Siemens SN29500, IEC 60721-3-1, failure rate, lifetime