Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Components sizing of powertrain for a Parallel Hybridization of the Mid-size Low-Floor Buses

중형저상버스 병렬형 하이브리드화를 위한 동력전달계 용량매칭

  • Kim, Gisu (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology) ;
  • Park, Yeong-il (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology) ;
  • Ro, Yun-sik (Jeonbuk Institute of Automotive Technology) ;
  • Jung, Jae-wook (Jeonbuk Institute of Automotive Technology)
  • 김기수 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 박영일 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 노윤식 (전북자동차기술원) ;
  • 정재욱 (전북자동차기술원)
  • Received : 2016.07.06
  • Accepted : 2016.08.11
  • Published : 2016.08.31
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Abstract

Most studies on hybrid buses are on large-sized buses and not mid-sized low-floor buses. This study uses MATLAB simulation to evaluate the fuel efficiency of such buses powered by diesel. Based on the results, a hybrid electric vehicle system is recommended for the best combination of power and gear ratio. A parallel hybrid system was selected for the hybridization, which transmits front and rear wheel power independently. The necessary power to satisfy the target performance was calculated, and the applicable capacity area was designed. Dynamic programing was used to create and optimize a component sizing algorithm, which was used to scale the capacity of each component of the power source to satisfy the design criteria. The fuel efficiency rate, optimum power source capacity, and gear ratio can be improved by converting a conventional bus into a parallel hybrid bus.

그 동안 하이브리드 버스에 대한 연구로 플러그인 하이브리드, 직렬형, 병렬형 하이브리드 등에 대한 연구가 많이 진행되어져 왔다. 하지만 연구가 진행된 대부분의 차량들은 대형 버스이며 현재 국내에는 중형저상버스에 대한 연구는 전무한 실정이다. 또한 중형저상버스의 하이브리드화에 대한 연구 역시 미미한 실정이다. 본 논문은 MATLAB을 이용한 시뮬레이션을 통해 디젤 중형저상버스의 연비 평가를 수행하였으며, 이를 하이브리드화하였을 경우에 대한 최적의 용량 조합과 기어비를 제시하고 내연기관 시뮬레이션 연비 결과와 비교 분석하였다. 하이브리드화를 위한 구조로 전륜과 후륜이 독립적으로 동력을 전달하는 병렬형 하이브리드 시스템을 선택하였다. 동력원 용량 설계를 위해 목표 성능을 만족하는 요구파워를 계산하여 적용 가능한 동력원 용량 영역을 설계하였다. 설계 영역을 만족하는 각 단품들의 용량은 스케일링하여 구성하였으며, 엔진과 모터에 대한 동력 전달계의 용량 설계 알고리즘을 제시하고 동적 계획법을 이용하여 최적화를 수행하였다. 최종적으로 본 연구를 통해 내연기관 차량인 중형저상버스를 하이브리드화하였을 경우에 대한 연비 향상률과 최적의 동력원 용량, 기어비를 제시하였다.

Keywords

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