J4  2010, Vol. 44 Issue (12): 2370-2375    DOI: 10.3785/j.issn.1008-973X.2010.12.023
 机械工程

State of charge estimation strategy of NiMH battery for
hybrid hydraulic excavator
GUAN Cheng, WANG Xiang-wei, WANG Dong-yun
Department of Mechanic Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract:

Due to the complicate working conditions of battery in hybrid hydraulic excavate(HHE), a new algorithm for battery state of charge(SOC) was proposed, which combined with two SOC model: one was based on conservation of energy to which the energy of battery reaction heat was added; and the other was based on an improved RC battery model for considering the hysteresis of battery, and the sigma point Kalman filter was applied to observe the improved RC model accurately. The combined algorithm was obtained by adjusting the weight factor of the two models. A charge and discharge experiment was done on NiMH battery. Three different SOC estimation methods, including SOC based on conservation of energy, SOC based on improved RC battery model, and SOC by the combined algorithm, were computed and compared. The result show that the combined algorithm has high accuracy and is suitable for HHE application.

 : TM 911.3

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