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System Engineering 방법론을 통한 기능 요구 사항 기반 시스템 최적화
박선홍(Sunhong Park),신희규(Heegyu Shin),이경택(Kyungtack Lee) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The steering system is becoming more complicated by the diversification and the development of high performance of electrical components. This trends have created tremendous requirements. Mando Steering R&D Center adopted System Engineering & MBSE (Model Based System Engineering) methodology to systematically manages and to develop the functional/functional safety requirements for the steering system. In this paper, the C-EPS durability test specifications were improved based on ’’Design to Function” which is an important methodology of system engineering. The test duration was dramatically shortened by optimizing the durability test specifications. As a result, the system was optimized. The weight and size of worm-wheel which is a reduction gear of C-EPS was reduced based on the improved durability test specifications.
EHC 기반 Urea-SCR 시스템 히터 표면온도 분포의 1-D 모델링
박선홍 ( Sunhong Park ),손지현 ( Jihyun Son ),문석수 ( Seoksu Moon ),오광철 ( Kwangchul Oh ),장성욱 ( Sungwook Jang ),박성서 ( Sungsuh Park ) 한국분무공학회 2022 한국액체미립화학회지 Vol.27 No.1
In upcoming Post Stage-V and Tier 5 regulations of construction machineries, nitrogen oxide (NOx) emissions are strictly limited in cold start conditions. In response to this, a method of improving NOx conversion efficiency has been applied by installing an electric heating catalyst (EHC) in front of conventional urea-SCR systems so that the evaporation and thermal decomposition of urea-water solution can be promoted in cold start conditions. In this strategy, the evaporation and thermal decomposition of urea-water solution and corresponding NOx conversion efficiency are governed by temperature conditions inside the EHC. Therefore, characterizing the temperature distribution in the EHC under various operating conditions is crucial for the optimized operation and control of the EHC in Urea-SCR systems. In this study, a 1-D modeling analysis was performed to predict the heater surface temperature distribution in EHC under various operating conditions. The reliability of prediction results was verified by comparing them with measurement results obtained using an infrared (IR) camera. Based on 1-D analysis results, the effects of various EHC operation parameters on the heater surface temperature distribution were analyzed and discussed.