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42 results on '"Lin, Yuanzheng"'

40. A double variable control load sensing system for electric hydraulic excavator

Author

Qihuai Chen, Zhongshen Li, Haibin Chen, Ren Haoling, Lin Yuanzheng, and Lin Tianliang

Subjects
Electric machine, Electronic speed control, business.product_category, Powertrain, Computer science, 020209 energy, Mechanical Engineering, Flow (psychology), 02 engineering and technology, Building and Construction, Energy consumption, Interference (wave propagation), Pollution, Industrial and Manufacturing Engineering, Excavator, General Energy, 020401 chemical engineering, Control theory, Range (aeronautics), 0202 electrical engineering, electronic engineering, information engineering, 0204 chemical engineering, Electrical and Electronic Engineering, business, Civil and Structural Engineering
Abstract

Traditional electric excavator only uses the electric machine to replace the engine and simulate its original working mode, which will not give full play to the advantages of the electric drive technology and result in poor control performance as well as low energy efficiency. In this paper, a load sensing system based on displacement adaptive and variable speed control is proposed for electric excavator to extend the flow matching range of power train system and satisfy the flow demand under different load conditions. Furthermore, a novel control strategy based on the hierarchical differential pressure control is studied. Through the control strategy, the novel load sensing system can adjust the load sensing pressure difference in stages without mutual interference, so as to maintain the power train system operation in high efficiency area, and reduce the energy loss of the valve. To verify the feasibility of the system and control strategy, the simulations and experimental test are carried out. The results show that the system and control strategy can improve the control performance effectively. The energy consumption can be also decreased by 19%–70%.

Published
2021

41. Development and key technologies of pure electric construction machinery

Author

Qihuai Chen, Haibin Chen, Lin Yuanzheng, Lin Tianliang, Zhongshen Li, and Ren Haoling

Subjects
Electric motor, Energy recovery, Electronic speed control, Renewable Energy, Sustainability and the Environment, Computer science, 020209 energy, 02 engineering and technology, Automotive engineering, Power (physics), Electrification, Hydroelectricity, 0202 electrical engineering, electronic engineering, information engineering, Electric power, Actuator
Abstract

With global warming and the energy crisis becoming more serious, the emission regulations for construction machinery (CM) are increasingly strict. The pure electric drive system is an inevitable trend for CMs. Although the pure electric drive system is widely used in the industry field and some technologies have been successfully transplanted to the mobile machines, it's not easy for CMs to realize the electrification. Types of pure electric CM (PECM) are discussed firstly to give a glance at PECM. Then the characteristics of a pure electric system for CMs are introduced. Key technologies, like variable speed control of the electric motor (EM), hydroelectric EM driving, new hydroelectric actuator, power supply, and energy recovery, are analyzed in depth. The difficulties of CMs to realize the electrification by comparing the difference between the pure electric power used in CM and the pure electric power used in the other fields. Moreover, the researches and developments in the pure electric drive systems for CMs are introduced. Finally, the challenges that researchers and the CM manufacturers will face are forecasted.

Published
2020

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