Parameter Matching and Control of Series Hybrid Hydraulic Excavator Based on Electro-Hydraulic Composite Energy Storage

Abstract

Traditional excavators driven by diesel engine have poor emissions and low energy efficiency. Pure electric driven excavators have high cost and limited endurance. Therefore, at present, hybrid power train system is an ideal candidate for excavators to realize energy-saving and emission reduction. In this paper, a novel series hybrid hydraulic excavator based on electro-hydraulic composite energy storage, which provides the average power of the system through the diesel engine, and the battery and accumulator are used as the intermediate energy storage devitalize the output current of the battery, and improve the service life of the battery, is proposed. Advantages of high energy density of battery and high power density of hydraulic accumulator are synthetically utilized. A 7-ton crawler excavator is taken as the research object, according to typical load spectrum, through analysis method and modeling method, and using dynamic programming (DP) to optimize the parameters of the novel series power train system. The control strategy of the power system is further studied, and the AMESim and Simlink co-simulation models of the transmission system is established to verify the feasibility of the system. At last, the experimental platform is built. Experiments are conducted to verify the effectiveness of the power train system.

A Survey of Powertrain Technologies for Energy-Efficient Heavy-Duty Machinery

“…The method can adjust the depth of hybridization of the diesel engine and the hydraulic system in real time according to the working condition. In the literature, energy management strategies of machines using hybrid hydraulic and electric energy storage units have also been investigated [167], [168].…”

Mechanical transmission system of loader based on hydraulic hybrid technology

“…When the deviation between the output state parameters and the actual demand is large, various types of control laws are switched through fuzzy language variables to ensure the accuracy and rapidity of the control results. When the deviation is small, PID control should be selected in this process to avoid steady-state error in the control process [10]. The aforementioned two control modes are mainly controlled according to the adjustment deviation, and the specific operation logic is:…”

Characterization Analysis of a New Energy Regenerative Electro-Hydraulic Hybrid Rotary System

“…Energy regeneration is a technology that recovers and reuses dissipated energy. According to the different methods of energy storage, energy recovery technologies can be classified into four major categories, such as mechanical [11]- [14] , hydraulic [15]- [19] , electric [20]- [22] , and hybrid energy storage [23]- [25] . Mechanical storage uses a flywheel as an energy storage unit.…”

“…A hydraulic excavator slewing brake energy recovery system was proposed by G. et al This system determines the stage of the energy recovery by automatically identifying the slewing motor inlet/outlet differential pressure. As a result of the simulation, 50% of the drive system's energy can be recovered by the slewing system alone, resulting in 16.3% energy savings compared to hydraulic excavators of the same cargo [23] . During the reversible rolling mill's work, the direction of rotation of the roll is changed after each pass.…”