| Hydraulic potential energy regeneration is the preferred hydraulic energy-saving technology for hydraulic excavators,truck cranes,hydraulic forklifts,and other engineering equipment,but for complex engineering application conditions,the traditional hydraulic potential energy regeneration system(HRPES)has many shortcomings such as large sive,expensive cost,complex circuit,and many conversion links,which are key factors limiting the application prospects of hydraulic potential energy regeneration technology.In this paper,considering the problems of space and cost limitation,low recovery pressure,and hydraulic circuit interference,four new types of HRPES are proposed and designed with accumulator,booster cylinder,and auxiliary cylinder as key components in order to maximize the regeneration of gravitational potential energy of the falling moving arm.Under the same working conditions,the energy recovery and energy reuse processes of HRPES were analyzed and discussed in depth through a half-experimental and half-simulation research method.Finally,to make the system keep energy recovery efficient in the energy recovery and energy release phases while ensuring the system’s operating performance is similar to that of a normal system,the designed HRPESs are combined with the special operating characteristics of the excavator,and the traditional PID and fuzzy PID control methods are used on the joint simulation platform of AMESim and Simulink to study the energy-saving and controllable perspective of the energy management and control strategies of four new types of HRPES.The main research contents of this paper are as follows.(1)In view of the current research difficulties,four new HRPES hydraulic circuits are proposed and designed in this paper,and the working process of energy recovery and reuse is analyzed and studied.The mathematical models of the main hydraulic components in HRPES are also established.(3)Simulation models of the No-Hydraulic Potential Energy Regeneration Module System(No-HRPES),Hydraulic Potential Energy Regeneration System-Ⅰ(HRPES-Ⅰ),Hydraulic Potential Energy Regeneration System-Ⅱ(HRPES-Ⅱ),Hydraulic Potential Energy Regeneration System-Ⅲ(HRPES-Ⅲ),and Hydraulic Potential Energy Regeneration System-Ⅳ(HRPES-Ⅳ)were established in AMESim,and provide the basis for parameter matching of the simulation models based on the specification parameters of SWE17-ED.(4)A test platform based on SWE-17ED was established to initially verify the reliability of the No-HRPES simulation model.On this basis,the feasibility and reliability of the four newly designed HRPESs were verified.At the same time,the energy consumption,as well as the motion characteristics of the test prototype,also provide the test basis for the energy saving of the newly designed hydraulic circuit.(5)According to the energy analysis,the energy-saving efficiency of HRPES-Ⅰ～HRPES-Ⅳ is 16.02%,22.84%,21.95%,and 27.15%,and their regeneration efficiency is 54.43%,57.76%,53.55%,and 57.97%,respectively.According to the results of energy efficiency analysis,it is known that HRPES with accumulator,booster cylinder,and the auxiliary cylinder can achieve energy-saving effect to a certain extent.And the HRPES-Ⅳwith booster cylinder,accumulator,and auxiliary cylinder in one has the best energy-saving effect,which can be directly applied to construction machinery or used as a reference for the design of energy-saving construction machinery hydraulic system.Finally,we also carried out the energy loss analysis of the main hydraulic components.(6)To improve the working performance of the system,we have studied the energy management and control strategy of HRPES-Ⅰ～HRPES-Ⅳ from the perspective of energy saving and controllability by combining the designed HRPES with the special working characteristics of the excavator.The system models of HRPES-Ⅰ～HRPES-Ⅳ with PID and fuzzy PID control algorithms are established on the joint simulation platform of AMESim snd Simulink to control the size of the system hydraulic valve opening.The results show that the fuzzy PID control is a control strategy that combines the advantages of the original system and the traditional PID control system,which also reflects the feasibility of the fuzzy PD control system in this scheme. |
