油液混合动力挖掘机流量耦合式及扭矩耦合式动力系统研究

发布时间：2018-05-07 04:39

本文选题：液压挖掘机 + 油液混合动力　；参考：《浙江大学》2015年博士论文

【摘要】：混合动力技术是实现挖掘机节能减排的有效途径,也是当前挖掘机节能研究的热点方向。其中油液混合动力因为其高功率密度、低成本等优势也开始受到国内外主机厂及研究机构的注意,但至今只有个别国外公司推出油液混合动力挖掘机,国内相关研究尚处于起步阶段。本文围绕油液混合动力挖掘机动力系统开展了结构设计、参数优化、控制策略、能量管理等方面的的研究,主要取得以下方面的进展：1、设计了一种基于流量耦合结构的挖掘机多工作装置能量回收系统,实现了动臂下降与回转运行状态的自动判断,及动臂势能与回转制动动能的自动回收；实现了回收油液与主泵流量的耦合输出。2、针对流量耦合式油液混合动力结构,提出一种以输出过程中能量损失最小及输出流量波动最小为控制目标的流量分配控制策略,实现了系统总输出流量与负载需求的匹配,辅助动力源与主动力源流量输出的自动分配,以及流量平稳输出。仿真与试验结果表明,采用该方法能解决系统总输出流量大幅振荡的问题,并提升节能效果约10%。3、以集成了扭矩耦合式发动机效率优化与工作装置能量回收的复合式油液混合动力挖掘机系统为研究对象,基于最优控制动态规划法,提出扭矩耦合式油液混合动力挖掘机系统的动力参数优化设计方法。以油耗最小为控制目标进行了动力系统参数优化设计,进而进行了发动机效率优化与工作装置能量回收的节能性研究。4、基于拉格朗日乘数法,提出了一种扭矩耦合式油液混合动力挖掘机系统的离线能量管理策略优化方法,进而提出了实时在线的能量优化管理策略,实现了对负载工况及蓄能器SOC的自适应控制。动态仿真结果验证了该方法能实时在线应用,同时能使复合式油液混合动力系统取得约20%的节能效果提升。
[Abstract]:Hybrid power technology is an effective way to realize the energy saving and emission reduction of the excavator, and it is also the hot direction of the current research on the energy saving of excavators. The oil mixture is also paid attention by the domestic and foreign host plants and research institutions because of its advantages of high power density and low cost, but only a few foreign companies have launched the oil mixed power excavation. The domestic related research is still in the initial stage. In this paper, the research on the structure design, parameter optimization, control strategy, energy management and other aspects of the power system of the hydraulic hybrids excavator is carried out in this paper. The main achievements are as follows: 1, a new energy recovery system based on the flow coupling structure is designed. The automatic recovery of the moving arm drop and rotary operating state and the automatic recovery of the movable arm potential energy and the rotational braking kinetic energy are realized, the output.2 of the recovery oil and the main pump flow is realized, and the minimum energy loss and the minimum output flow fluctuation in the output process are proposed. The flow distribution control strategy of the target system has realized the matching of the total output flow of the system with the load demand, the automatic distribution of the auxiliary power source and the output of the active power source, and the steady output of the flow. The simulation and test results show that the method can solve the problem of the large oscillation of the total output flow of the system and improve the energy saving effect of about 10%.3 In order to integrate the efficiency optimization of the torque coupled engine and the energy recovery of the working device, the optimization of the dynamic parameters of the torque coupled hydraulic hybrid excavator system is proposed based on the optimal control dynamic programming method, which is based on the minimum fuel consumption as the control target. The optimization of the dynamic system parameters is designed, and the energy efficiency of the engine efficiency optimization and the energy recovery of the working device is studied.4. Based on the Lagrange multiplier method, an off-line energy management strategy optimization method for the torque coupled hydraulic hybrids system is proposed, and the real-time online energy optimization management strategy is put forward. The adaptive control of the load condition and the accumulator SOC is realized. The dynamic simulation results show that the method can be applied in real time on line, and the energy saving effect of the hybrid oil hybrid power system can be improved by about 20%.

【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU621

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