Sun Zhiyuan, Zeng Qingliang, Wan Lirong, Jiang Jinying
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
College of Information Science and Engineering, Shandong Normal University, Jinan 250358, China.
ACS Omega. 2023 Jul 26;8(31):28592-28607. doi: 10.1021/acsomega.3c03046. eCollection 2023 Aug 8.
The flow control range of the double-compound axial piston pump with the traditional mechanical-hydraulic feedback servo control is limited and the accuracy is poor. Accordingly, this paper proposes a digital control scheme and its control strategy using a linear stepper motor direct drive servo valve for the precise control and double pumps cooperation of the double-compound axial piston pump. A numerical model of the digital control double-compound axial piston pump is established, and the validity of the model is verified by experimental tests. The performance advantages of the digital control method relative to the mechanical-hydraulic feedback servo control method are analyzed, as is the performance of the control strategy for double pumps. The results show that the digital control method can achieve a wider range of flow control than the traditional mechanical-hydraulic feedback servo control method and avoid the torque impact on the prime mover caused by the active control. The combination of the flow control and the power control including four control modes can meet the performance requirements of the double-compound axial piston pump. The highest priority is given to the energy-saving control, which can reduce the displacement of the main pump in the nonworking state to reduce the additional power loss. The study provides a basis for the accurate matching and optimization of power to load and flow to operating speed of the double-compound axial piston pump.
采用传统机械 - 液压反馈伺服控制的双复合轴向柱塞泵流量控制范围有限且精度较差。因此，本文提出一种数字控制方案及其控制策略，该策略采用直线步进电机直接驱动伺服阀实现双复合轴向柱塞泵的精确控制及双泵协同工作。建立了数字控制双复合轴向柱塞泵的数值模型，并通过实验测试验证了模型的有效性。分析了数字控制方法相对于机械 - 液压反馈伺服控制方法的性能优势以及双泵控制策略的性能。结果表明，数字控制方法比传统机械 - 液压反馈伺服控制方法能实现更宽的流量控制范围，且可避免主动控制对原动机造成的扭矩冲击。流量控制与功率控制相结合的四种控制模式能够满足双复合轴向柱塞泵的性能要求。其中节能控制优先级最高，它可在非工作状态下减小主泵排量，以降低额外的功率损耗。该研究为双复合轴向柱塞泵的功率与负载精确匹配以及流量与工作速度优化提供了依据。
