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Development of Power Management Strategies for a Compound Hybrid Excavator

복합형 하이브리드 굴삭기를 위한 동력전달계 제어기법 연구

  • Received : 2010.12.13
  • Accepted : 2011.10.24
  • Published : 2011.12.01

Abstract

This paper presents the power management strategies for a compound hybrid excavator. The compound hybrid excavator has been replaced the hydraulic swing motor to the electric swing motor. This excavator requires a proper control algorithm to regulate the energy flow between the mechanical coupling and the electric devices. The controller should improve fuel economy and maintain the super capacitor voltage within a proper range. A thermostat controller and ECMS controller are designed such that these objectives can be achieved. The thermostat controller regulates the power of the engine-assist motor on the basis of the super capacitor voltage, and the ECMS controller determines it using the real-time fuel minimization strategy based on the concept of equivalent fuel. Simulation results showed that by using the hybrid excavator, the fuel economy becomes about 20% higher than that obtained using the conventional excavator and that the ECMS controller outperforms the thermostat controller.

Keywords

Compound Hybrid Excavator;Power Management Strategy;ECMS Strategy

Acknowledgement

Grant : 하이브리드 굴삭기 핵심기술 개발

Supported by : 한국학술진흥재단, 한국연구재단

References

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  2. Xiao, Q., 2007, "Control Strategies of Power System in Hybrid Hydraulic Excavator," Automation in Construction.
  3. Yanting, Z., 2006, "Constant Work-Point Control for Parallel Hybrid System with Capacitor Accumulator in Hydraulic Excavator," Chinese Journal of Mechanical Engineering, Vol. 19, No. 4, pp. 505-508. https://doi.org/10.3901/CJME.2006.04.505
  4. Lin, X., 2008, "Dynamic Simulation and Optimal Control Strategy for a Parallel Hybrid Hydraulic Excavator," Journal of Zhejiang University SCIENCE A, pp. 624-632.
  5. Yoo, S., 2009, "Design and Control of Hybrid Electric Power System for a Hydraulic Actuated Excavator," SAE International.
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