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기능 안전 설계/평가 프로세스(ISO 13849) 적용한 지게차용 변속기 제어 유닛(TCU) 개발과 H/W-S/W 레벨 및 실차 레벨 검증
백종희(J. H. Baek),김경수(K. S. Kim),조성진(S. J. Cho),정명길(M. K. Jung) 유공압건설기계학회 2022 유공압건설기계학회 학술대회논문집 Vol.2022 No.06
As the application of automation, intelligent technologies in construction equipment has been increased rapidly, nowadays functional safety regulation on the SRP/CS(Safety Related Parts of Control System) of fork-lift trucks become more strictly applied based on ISO 13849, EN 1175, etc. So, we applied functional safety principles in TCU(Transmission Control Unit) for industrial trucks and performed verification and validation in accordance with ISO 13849, for the first time in Korea. As a result, we developed TCU H/W with the PFHd of 0.392 × 10<SUP>-6</SUP>(1/h). We also conducted S/W tests such as static analysis for MISRA-C compliant rate, dynamic tests for white-box and black-box test, all of which are compliant to PLc/Category 2 or the higher level.
SN 29500 기반의 환경 스트레스 변동을 고려한 건설기계 제어기의 고장률 추정 방법론
백종희(J. H. Baek),이길수(K. S. Lee),이경준(K. J. Lee) 유공압건설기계학회 2023 유공압건설기계학회 학술대회논문집 Vol.2023 No.5
In parallel to increasing the application of intelligent, automated and unmanned Construction Equipment, functional safety regulation for Safety Related Parts of Control System(SRP/CS) has been reinforced in Europe, etc. In this paper, we will briefly review the methods of hardware failure rate estimation, which is a basis for functional safety requirements based on ISO 13849, etc. Instead of actual controllers used in the field, a virtual controller with multiple inputs and outputs will be considered here, also a virtual bill of materials(BOM) consisted with passive elements and active elements will be listed. Based on these database, We will estimate failure rate of each components based on SN 29500, and then hardware FMEA will be performed for this virtual controller. By doing this, We will show how to estimate hardware failure rate in accordance with ISO 13849, etc.