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하이브리드 지게차 엔진-발전기의 제어 개념 및 연비 추정의 신뢰성 평가
김성철(Seongcheol Kim),최세경(Sekyung Choi),정명길(Myungkil Jung),김준혁(Junhyuk Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
This paper presents control concepts of engine-generator and reliability evaluation of fuel efficiency estimation through engine dynamometer test. In terms of speed or torque control concepts, the control methods of engine-generator are tested about four cases, and the response characteristics were analyzed. This test was carried out assuming engine-generator system similar to engine dynamometer. The control concept of engine-generator is needed to develop a higher level control algorithm of the hybrid forklifts such as HCU (Hybrid Control Unit). When HCU algorithm is developed, the engine static fuel efficiency map is mostly used to evaluate fuel efficiency of HCU algorithm even if simulation profiles are under dynamic situation. To verify reliability of estimated fuel efficiency based on the engine static fuel efficiency map, the estimated fuel consumption was compared to measured fuel consumption in the dynamic operation situation of an engine. This test result showed usability of a fuel consumption estimation using engine static fuel efficiency map.
김성철(Seongcheol Kim),최세경(Sekyung Choi),정명길(Myungkil Jung),윤재학(Jaehak Yoon) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This paper presents the modeling and analysis of a power system on hybrid forklift. The modeling of hybrid is useful to predict the performance of the forklift and to determine the specifications of components such as engine, motors and batteries when the forklift is in the early stage of development. The hybrid configuration and characteristics are demonstrated to explain the modeling techniques. The model is validated by the test data of engine forklifts in the VDI cycle. The power system is analyzed in terms of the required power in case that forklift is driving or working. The fuel efficiency is also simulated, and the effect of hybridization on forklift is demonstrated.