Experiment study on flow compensation of electro-hydraulic flow
matching control system in hydraulic excavator
XU Bing1, LIU Wei1,2, YANG Hua-yong1, ZHANG Sheng-feng1
1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China；
2. Zoomlion Heavy Industry Science and Technology Co., Ltd., Changsha 410013, China
In order to obtain an advanced operation performance and an improved energy efficiency of hydraulic systems in excavators, electro hydraulic flow matching control (EFMC) systems were introduced, in which electro-proportional valves and electro-proportional pumps worked in a synchronous control mode. The principle and characteristics of EFMC systems were analyzed in the experimental prototype of 2-ton excavator that installed an EFMC system. Based on the characteristics of system pressure and flow rate, the open-loop flow compensation of the excavator was experimentally studied under the conditions of light and heavy loads. Real-time velocity was monitored and used to carry out flow closed-loop control indirectly. Both on the boom and bucket, the velocity characteristics of single and compound action were experimentally investigated with different loads and reference velocities. The experimental results indicate that the accuracy of flow control is improved by the use of flow compensation methods. Compared with the load-sensing system, the EFMC system has a more improved capability. The pressure margin of the EFMC system is reduced by more than 0.6-0.7 MPa, and the systemic performance of dynamic response and energy efficiency are improved.
XU Bing, LIU Wei, YANG Hua-yong, ZHANG Sheng-feng. Experiment study on flow compensation of electro-hydraulic flow
matching control system in hydraulic excavator. J4, 2012, 46(8): 1382-1389.
［1］ LANTTO B. On fluid power control with special reference to multiload conditions in load sensing systems ［D］. Linkoping: Linkoping University, 1992: 2-40.
［2］ 王庆丰,魏建华,吴根茂,等.工程机械液压控制技术的研究进展与展望［J］.机械工程学报,2003,39(12): 51-56.
WANG Qingfeng, WEI Jianhua, WU Genmao, et al. Progress and prospects in the research of hydraulic control for construction machine ［J］. Chinese journal of mechanical engineering, 2003, 39(12): 51-56.
［3］ 孔晓武.带长管道的负载敏感系统研究［D］.杭州:浙江大学,2003: 5-30.
KONG Xiaowu. Research on the loadsensitive system with long tipe ［D］. Hagnzhou: Zhejiang University, 2003: 5-30.
［4］ CETINKUNT S, PINSOPON U, CHEN C. Positive flow control of closedcenter electrohydraulic implementbywire systems for mobile equipment applications ［J］. Mechatronics, 2004, (14): 403-420.
［5］ FEDDE T, HARMS H H. An adaptive hydraulic system for mobile applications ［C］∥Proceedings of the 5th International Fluid Power Conference. Aachen, Germany: IFK, 2006: 95-106.
［6］ FEDDE T, LANG T, HARMS H H. An adaptable hydraulic system for tractors ［C］∥Proceedings of Power Transmission and Motion Control. BATH, UK: PTMC, 2005: 307-316.
［7］ DUROVIC M, HELDUSER S. New control strategies for electrohydraulic load sensing ［C］∥Proceedings of the Bath Workshop on Power Transmission and Motion Control. BATH, UK: PTMC, 2004: 201-210.
［8］ HELDUSER S, DJUROVIC M. Control strategies for loadsensing in mobile machinery ［C］∥Proceedings of the 6th International Conference on Fluid Power Transmission and Control. Hangzhou: ICFP, 2005: 32-42.
［9］ FINZEL R., HELDUSER S. New electrohydraulic control systems for mobile machinery ［C］∥Proceedings of the Fluid Power and Motion Control FPMC 2008. BATH, UK: FPMC, 2008: 309-321.
［10］ GROSBRINK B, HARMS T. Control concept for an advanced loadsensing system ［C］∥Proceedings of the 7th International Conference on Fluid Power Transmission and Control. Hangzhou: ICFP, 2009: 201-204.
［11］ FINZEL R, HELDUSER S, JANG D S. Electrohydraulic control systems for mobile machinery with low energy consumption ［C］∥Proceedings of the 7th International Conference on Fluid Power Transmission and Control. Hangzhou: ICFP,2009: 214-219.
［12］ 张栋,许纯新,金立生,等.挖掘机单神经元比例积分微分节能控制系统［J］.西安交通大学学报,2004,38(5): 529-532.
ZhANG Dong, XU Chunxin, JIN Lisheng, et al. Research on energy saving control system of hydraulic excavator based on selfadaptive single neuron proportionintegraldifferential ［J］. Journal of Xi’an Jiaotong University, 2004, 38(5): 529-532.
