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윤재학(J.H. Yoon),김성기(S.K. Kim),권영민(Y.M. Kwon) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6
Recently, the application of electrical and electronic (E/E) control system has been increased in the construction equipment. Thus, the risks caused by systemic failure and potential malfunction of the E/E control system should be considered in design process. The design methods according to the functional safety standards have been recommended to reduce these risks because they could not be removed only by the quality control. This paper described the functional safety design by using design & verification methods based on the development process of ISO 26262, ISO 13849 and ISO 15998. The support process for the functional safety was described by the standard for automobile (ISO 26262) including state-of-the-art methods. The functional safety design methods are expected to improve not only the functional safety but the quality and the reliability of the E/E control systems as well.
진기창(K.C. Jin),이종찬(J.C. Lee),이상훈(S.H. Lee),권영민(Y.M. Kwon) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
As an effort to develop more efficient and environmentally friendly system for excavator, boom regeneration system has been widely taken into account. The mid-size electric excavator, which is manufactured in 2013 through the government R&D project, also adopted the boom regeneration system. In the regeneration system, a hydraulic motor is drived by tank return flow on boom down operation and an electric motor combined with a motor generates electric energy. The electric energy is once stored in battery and reused in next operation. In this paper, the structure and mechanism of the boom regeneration system are introduced. Furthermore, the algorithm which is designed for achieving energy efficiency and performance and test results for validation are explained.