Study on the Improvement Methods of Engine Efficiency in Hybrid Excavator

하이브리드 굴삭기용 엔진의 효율 향상 방안에 관한 연구

  • Received : 2015.11.30
  • Accepted : 2016.03.31
  • Published : 2016.07.01


In this paper, a study based on engine operating conditions versus hybrid excavator engines was conducted about the engine performance and fuel consumption via the 1-D engine simulation model. First of all, engine operating points with performance and emission were determined by driving patterns. The 1-D HFEM(High Frequency Engine Model) was developed for deep insight into engine combustion and the energy conversion phenomena. In accordance with changing operating points, especially High Idle and Rated output conditions, engine parameters and systems such as turbocharger(Waste Gate Turbocharger and Variable Geometry Turbocharger) injection strategies and EGR(Exhaust Gas Recirculation) should be considered. Therefore, various configurations and parametric analysis with optimization methods in hybrid excavator were simulated and optimized by NLPQL(Non-linear Programming by Quadratic Lagrangian algorithm) in 1-D HFEM. As a result, the fuel consumption with the developed hybrid electric excavator engine could be significantly decreased and bsfc(Brake Specific Fuel Consumption) was also reduced about 5 % to 7 % without any performance degradation.


Hybrid excavator;Bsfc;Fuel consumption;Variable geometry turbocharger;Exhaust gas recirculation


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Grant : 융합지식기반 창조형 기계항공인재 양성사업단

Supported by : 서울대학교