Wheel Loader Hybrid System Electric Torque Converting Control Strategy

doi:10.3901/JME.2023.24.251

Abstract

Abstract: To improve wheel loader transmission efficiency and fuel economy, a planetary electromechanical coupling system is proposed, which is applied to hybrid wheel loader, it both can couple the power of engine and motor and can convert torque by the mean of electric torque converting. A mathematical model about planetary electromechanical coupling system is built, and then expounded power distribution rules and torque converting in mechanism of this system. A control strategy of electric torque converting hybrid wheel loader is developed, by the strategy, the electric torque converting mode can be free of SOC constraint by the mean of transmission downshifting or upshifting and engine speed adjusting. A hybrid wheel loader simulation system is built up, the simulation result shows that the hybrid wheel loader with planetary electromechanical coupling system can emulate the traditional hydraulic torque convertor function by the means of electric torque converting and it can recover the engine surplus energy in the torque converting process by the function of motor reversal and generation. The function of electric torque convert and motor reversal and generation of planetary electromechanical coupling system are verified by test bed. The electric torque converting mechanism is expounded by the means of mathematical model; the simulation results show that, when the hybrid wheel loader with planetary electromechanical coupling system working with soft material it could save fuel 25.9% than traditional wheel loader, and with raw material it could save fuel 27.1%, the shoveling and digging working time occupied ratio more the hybrid wheel loader energy saving rate was more obviously; by the test bed of hybrid wheel loader with planetary electromechanical coupling system, more than 90% engine surplus energy distributing to the power train system can be retrieved by motor reversal and generation during the digging process. It can provide principle and structure reference and control strategy support for hybridization and high efficiency torque converting of similar construction machinery such as wheel loader.

Key words: hybrid, wheel loader, planet coupling, electric torque convert, power reversal

CLC Number:

TH122

ZOU Naiwei, WEI Jianwei, DUAN Chuandong, CHU Changxiang. Wheel Loader Hybrid System Electric Torque Converting Control Strategy[J]. Journal of Mechanical Engineering, 2023, 59(24): 251-261.

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