New Progress in Energy-efficient Electrical Drive and Hydraulic Transmission Technologies for Non-road Mobile Equipment
QUAN Long, YAN Zhixin, ZHANG Shuofeng, YANG Yuxin, GE Lei, LI Zepeng
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Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024
Under the dual-carbon background, electric drive becomes an important way to solve the problem of carbon emission and energy waste of non-road mobile equipment. However, the current first-generation electric drive machine only replaces the combustion engine with batteries and motors. Hydraulic system is still using the valve control mode that centralized power supply energy, multi-way valve distributes the power. The existing technology has the disadvantages of system energy conversion and low transfer efficiency. Need to use a large capacity battery to meet the needs of the machine working hours, which also leads to the high cost of the machine, restricting its application. Therefore, improving the energy efficiency of hydraulic system becomes the key to break the bottleneck of electrification technology of non-road mobile equipment. This paper analyzes and discusses the latest international methods, research progress and application effect of digital variable displacement pump, discrete digital hydraulic valve and floating cup pump which can significantly improve the energy efficiency of hydraulic system. Finally, the working principle, energy efficiency characteristics and application results of the teams proposed electric-hydraulic dual-drive heavy-duty linear actuator are introduced. Compared with the existing technology, the four new transmission modes can increase the energy efficiency of the system by more than 50%, which lays a foundation for the popularization and application of the electric non-road mobile equipment.
QUAN Long, YAN Zhixin, ZHANG Shuofeng, YANG Yuxin, GE Lei, LI Zepeng.
New Progress in Energy-efficient Electrical Drive and Hydraulic Transmission Technologies for Non-road Mobile Equipment[J]. Journal of Mechanical Engineering, 2023, 59(20): 385-400 https://doi.org/10.3901/JME.2023.20.385
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