带旁路压力补偿的电液流量匹配系统
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摘要
针对负载敏感系统效率低、响应慢的问题,提出一种带旁路压力补偿的电液流量匹配系统.该系统根据负载流量需求直接控制泵的排量,引入旁路压力补偿回路以解决由过流匹配带来的压力冲击和能量损失.建立该系统与机液负载敏感系统的数学模型,并对两者的动态特性进行对比分析.建立基于2t液压挖掘机的实验样机,进行典型工况下动臂提升动作以及动臂/铲斗复合动作实验研究.理论与实验结果表明:所提出的系统通过采用旁路压力补偿和流量匹配方法,提高了压力可控性和阻尼性能,系统压力裕度和响应时间相比机液负载敏感系统分别降低了0.6~0.7 MPa和0.5s,同时负载速度振荡减小,提高了所提出系统的效率和操控性能.
An electrohydraulic flow matching system with bypass pressure compensation was proposed aiming at the low efficiency and slow response of the load sensing systems.In the system,the pump displacement was directly controlled based on load flow requirements.The bypass pressure compensation circuit was introduced to solve the problems of pressure impact and energy loss caused by flow excess.The mathematical models of load sensing system and the proposed system were established,and their dynamic behaviors were analyzed and compared.An experimental prototype was developed based on a 2-ton hydraulic excavator.The experimental tests were conducted under the typical working conditions of boom lifting motion and boom/bucket compound motion.The theoretical and experimental results indicated that the pressure controllability and damping performance were improved in the proposed system by using the bypass pressure compensation and the flow matching method.The pressure margin and the response time were reduced by 0.6~0.7 MPa and 0.5s,respectively,in contrast to those of the load sensing system.Meanwhile,the oscillation of load velocity was reduced.Therefore,the efficiency and controllability of the proposed system were improved.
An electrohydraulic flow matching system with bypass pressure compensation was proposed aiming at the low efficiency and slow response of the load sensing systems.In the system,the pump displacement was directly controlled based on load flow requirements.The bypass pressure compensation circuit was introduced to solve the problems of pressure impact and energy loss caused by flow excess.The mathematical models of load sensing system and the proposed system were established,and their dynamic behaviors were analyzed and compared.An experimental prototype was developed based on a 2-ton hydraulic excavator.The experimental tests were conducted under the typical working conditions of boom lifting motion and boom/bucket compound motion.The theoretical and experimental results indicated that the pressure controllability and damping performance were improved in the proposed system by using the bypass pressure compensation and the flow matching method.The pressure margin and the response time were reduced by 0.6~0.7 MPa and 0.5s,respectively,in contrast to those of the load sensing system.Meanwhile,the oscillation of load velocity was reduced.Therefore,the efficiency and controllability of the proposed system were improved.
引文
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[10]AXIN M,ERIKSSON B,PALMBERG J O.Energy efficient load adapting system without load sensing:design and evaluation[C]∥Proceedings of the 11th Scandinavian International Conference on Fluid Power.Linkping:Linkping University,2009:1-21.
[11]AXIN M.Fluid power systems for mobile applications[D].Linkping:Linkping University,2013:15-26.
[12]AXIN M,ERIKSSON B,KRUS P.Flow versus pressure control of pumps in mobile hydraulic systems[J].Proceedings of the Institution of Mechanical Engineers,Part I:Journal of Systems and Control,2014,228(4):245-256.
[13]AXIN M,ERIKSSON B,KRUS P.A hybrid of pressure and flow control in mobile hydraulic systems[C]∥The 9th International Fluid Power Conference.Aachen:IFK,2014:190-201.
[14]DJUROVIC M.Energiesparende antriebssysteme für die arbeitshydraulik mobiler arbeitsmaschinen“elektrohydraulisches flow matching”[D].Dresden:Dresden University of Technology,2007:72-74.
[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 Qing-feng,WEI Jian-hua,WU Gen-mao,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]WEBER J,BURGET W.Mobile systems-markets,industrial needs and technological trends[C]∥Proceeding of the 8th International Fluid Power Conference,Dresden:IFK,2012:23-54.
[4]权龙.工程机械多执行器电液控制技术研究现状及最新进展[J].液压气动与密封,2010,1:40-45.QUAN Long.The present status and latest progress of electrohydraulic control technology of multi-actuators used in construction machinery[J].Hydraulics Pneumatics and Seals,2010,1:40-45.
[5]ZAHE B.Energiesparende scveranderlichem hydraulischer antriebe mit versorgungsdrunk haltungen und ihre regelung[D].Aachen:RWTW Aachen University,1993.
[6]DUROVIC M,HELDUSER S.New control strategies for electrohydraulic load sensing[C]∥Proceedings of the Bath Workshop on Power Transmission and Motion Control.Bath:PTMC,2004:201-210.
[7]HELDUSER S,DJUROVIC M.Control strategies for load-sensing in mobile machinery[C]∥Proceedings of the 6th International Conference on Fluid Power Transmission and Control.Hangzhou:ICFP,2005:32-42.
[8]GRSBRINK B,BAUMGARTEN T.Control concept for an advanced load-sensing system[C]∥Proceedings of the 7th International Conference on Fluid Power Transmission and Control.Hangzhou:ICFP,2009:201-204.
[9]GRSBRINK B,BAUMGARTEN T,HARMS H.Alternating pump control for a load-sensing system[C]∥Proceedings of the 7th International Fluid Power Conference.Aachen:IFK,2010:1-12.
[10]AXIN M,ERIKSSON B,PALMBERG J O.Energy efficient load adapting system without load sensing:design and evaluation[C]∥Proceedings of the 11th Scandinavian International Conference on Fluid Power.Linkping:Linkping University,2009:1-21.
[11]AXIN M.Fluid power systems for mobile applications[D].Linkping:Linkping University,2013:15-26.
[12]AXIN M,ERIKSSON B,KRUS P.Flow versus pressure control of pumps in mobile hydraulic systems[J].Proceedings of the Institution of Mechanical Engineers,Part I:Journal of Systems and Control,2014,228(4):245-256.
[13]AXIN M,ERIKSSON B,KRUS P.A hybrid of pressure and flow control in mobile hydraulic systems[C]∥The 9th International Fluid Power Conference.Aachen:IFK,2014:190-201.
[14]DJUROVIC M.Energiesparende antriebssysteme für die arbeitshydraulik mobiler arbeitsmaschinen“elektrohydraulisches flow matching”[D].Dresden:Dresden University of Technology,2007:72-74.