Dynamic simulation and optimal control strategy for a parallel hybrid hydraulic excavator |
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| Authors: | Xiao Lin Shuang-xia Pan and Dong-yun Wang |
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| Institution: | State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | The primary focus of this study is to investigate the control strategies of a hybrid system used in hydraulic excavators. First, the structure and evaluation target of hybrid hydraulic excavators are analyzed. Then the dynamic system model including batteries, motor and engine is built as the simulation environment to obtain control results. A so-called multi-work-point dynamic control strategy, which has both closed-loop speed PI (proportion integral) control and direct torque control, is proposed and studied in the simulation model. Simulation results indicate that the hybrid system with this strategy can meet the power demand and achieve better system stability and higher fuel efficiency. |
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| Keywords: | Hybrid system Hydraulic excavator Multi-work-point dynamic control Direct torque control |
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