하이브리드 지게차 엔진-발전기의 제어 개념 및 연비 추정의 신뢰성 평가

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.