Dual-Pump Hydraulic Hybrid Excavator with Combined Common Pressure Rail and Valve-Controlled System

2012 ◽  
Vol 233 ◽  
pp. 62-65
Author(s):  
Wei Shen ◽  
Ji Hai Jiang
Keyword(s):  
Hydraulic Excavator ◽  
Hydraulic Architecture ◽  
Design Requirement ◽  
Pump System ◽  
Controlled System ◽  
Hydraulic Hybrid ◽  
Low Efficiency ◽  
Cost Efficient ◽  
Hybrid Excavator ◽  
Common Pressure Rail

To solve the low efficiency problem of hydraulic excavator, one type of Dual-Pump hydraulic architecture with combined Common Pressure Rail (CPR) and traditional valve controlled system is presented. Firstly, we analyze the energy consumption of excavator during one cycle to know the energy distribution among each actuator. Then, the Dual-Pump system is explained to design an easy to modify, cost efficient hydraulic hybrid excavator. Moreover, we focus on the boom system and construct the model. Finally, a simulation is created and the results illustrate that the proposed system can satisfy the design requirement.

scholarly journals Parameter Matching Analysis of Hydraulic Hybrid Excavators Based on Dynamic Programming Algorithm

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Wei Shen ◽  
Jihai Jiang ◽  
Xiaoyu Su ◽  
Hamid Reza Karimi
Keyword(s):  
Dynamic Programming ◽  
General Principle ◽  
Hot Spot ◽  
Dynamic Programming Algorithm ◽  
Programming Algorithm ◽  
Hydraulic Hybrid ◽  
Parameter Matching ◽  
Calculation Results ◽  
Hybrid Excavator ◽  
Common Pressure Rail

In order to meet the energy saving requirement of the excavator, hybrid excavators are becoming the hot spot for researchers. The initial problem is to match the parameter of each component, because the system is tending to be more complicated due to the introduction of the accumulator. In this paper, firstly, a new architecture is presented which is hydraulic hybrid excavator based on common pressure rail combined switched function (HHES). Secondly, the general principle of dynamic programming algorithm (DPA) is explained. Then, the method by using DPA for parameter matching of HHES is described in detail. Furthermore, the DPA is translated into the M language for simulation. Finally, the calculation results are analyzed, and the optimal matching group is obtained.

scholarly journals Energy-Saving Analysis of Hydraulic Hybrid Excavator Based on Common Pressure Rail

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Wei Shen ◽  
Jihai Jiang ◽  
Xiaoyu Su ◽  
Hamid Reza Karimi
Keyword(s):  
Dynamic Response ◽  
Energy Saving ◽  
Fuel Consumption ◽  
Environment Friendly ◽  
Hydraulic Hybrid ◽  
Manufacture Process ◽  
Hybrid Excavator ◽  
Save Energy ◽  
Common Pressure Rail ◽  
Fast Dynamic

Energy-saving research of excavators is becoming one hot topic due to the increasing energy crisis and environmental deterioration recently. Hydraulic hybrid excavator based on common pressure rail (HHEC) provides an alternative with electric hybrid excavator because it has high power density and environment friendly and easy to modify based on the existing manufacture process. This paper is focused on the fuel consumption of HHEC and the actuator dynamic response to assure that the new system can save energy without sacrificing performance. Firstly, we introduce the basic principle of HHEC; then, the sizing process is presented; furthermore, the modeling period which combined mathematical analysis and experiment identification is listed. Finally, simulation results show that HHEC has a fast dynamic response which can be accepted in engineering and the fuel consumption can be reduced 21% to compare the original LS excavator and even 32% after adopting another smaller engine.

A Robust Multi-Input Multi-Output Control Strategy for the Secondary Controlled Hydraulic Hybrid Swing of a Compact Excavator With Variable Accumulator Pressure

2014 ◽  
Author(s):  
Enrique Busquets ◽  
Monika Ivantysynova
Keyword(s):  
Power Management ◽  
Management Strategies ◽  
Hydraulic Motor ◽  
Robust Performance ◽  
Output Control ◽  
Controlled System ◽  
Output Controller ◽  
Hydraulic Hybrid ◽  
Hydraulic Accumulator ◽  
First Time

Over the last decade, a number of hybrid architectures have been proposed with the main goal of minimizing energy consumption of excavator swing drives. One of the most notorious architectures is the secondary controlled hydraulic swing drive. One of the advantages of this system is that, through the installation of a hydraulic accumulator, energy which otherwise would be wasted can be stored and reutilized on demand. However, the fact that the hydraulic motor in this architecture operates under a constant high pressure at all times diminishes the overall system efficiency significantly. Therefore, to investigate machine power management strategies, it is imperative to formulate a controller that overcomes this weakness. In this paper, a robust multi-input multi-output controller is synthesized for the control of the hybrid swing velocity and for first time the control of the accumulator state of charge. The simplified plant is tested using a high fidelity nonlinear model developed in the Simulink-Matlab environment. The proposed controller is then tested and compared against a PI controller using the optimal accumulator pressure obtained from dynamic programming and the desired cab velocity. Results show satisfactory tracking of the swing drive velocity and pressure. In addition, a study of the nominal stability, robust stability and robust performance of the controlled system reveals the advantages of the H∞ controller.

Optimal Control for the Series-Parallel Displacement Controlled Hydraulic Hybrid Excavator

2011 ◽  
Author(s):  
Joshua Zimmerman ◽  
Rohit Hippalgaonkar ◽  
Monika Ivantysynova
Keyword(s):  
Optimal Control ◽  
Fuel Consumption ◽  
Hybrid System ◽  
State Space Model ◽  
Optimal Controls ◽  
Parallel Displacement ◽  
Hydraulic Hybrid ◽  
Truck Loading ◽  
System States ◽  
Hybrid Excavator

In this paper a hydraulic hybrid system architecture for multi-actuator displacement controlled systems is analyzed. In particular the problem of optimal control for a hybrid excavator with four actuators is solved. The system states and controls are identified and classified into those which are cycle defined and those which are free to vary during the duty cycle. A state space model is derived for the hybrid system using the free states and controls and an outline of the algorithm used to apply dynamic programming to the system is described. The optimal controls and states for an aggressive truck loading cycle of the excavator are compared with suboptimal controls and states obtained using a rule based control strategy. Finally a comparison is made for the simulated fuel consumption of the system using optimal and suboptimal controls. A comparison is also made between the fuel consumption of the hybrid and non-hybrid excavators.

Control strategy analysis of the hydraulic hybrid excavator

2015 ◽  
Vol 352 (2) ◽  
pp. 541-561 ◽  
Author(s):  
Wei Shen ◽  
Jihai Jiang ◽  
Xiaoyu Su ◽  
Hamid Reza Karimi
Keyword(s):  
Control Strategy ◽  
Strategy Analysis ◽  
Hydraulic Hybrid ◽  
Hybrid Excavator

scholarly journals Hydraulic Hybrid Excavator—Mathematical Model Validation and Energy Analysis

Energies ◽  
2016 ◽  
Vol 9 (12) ◽  
pp. 1002 ◽  
Author(s):  
Paolo Casoli ◽  
Luca Riccò ◽  
Federico Campanini ◽  
Andrea Bedotti
Keyword(s):  
Mathematical Model ◽  
Model Validation ◽  
Energy Analysis ◽  
Hydraulic Hybrid ◽  
Hybrid Excavator

Potential Energy Recovery System of Hydraulic Hybrid Excavator

2016 ◽  
Author(s):  
Pengyu Zhao ◽  
Yinglong Chen ◽  
Hua Zhou
Keyword(s):  
Potential Energy ◽  
Energy Recovery ◽  
Load Force ◽  
Dissipated Energy ◽  
Energy Recovery System ◽  
Hydraulic Hybrid ◽  
Recovery System ◽  
Parameter Matching ◽  
Hybrid Excavator ◽  
The Mathematical Model

For existing hydraulic hybrid excavators, the loss of energy is still too large and the energy recovery efficiency is not high enough. Concerning these issues, a new hydraulic hybrid excavator potential energy recovery system is proposed within this paper. The energy recovery system uses three-chamber cylinders (TCCs) and accumulators to recover the potential energy of mechanical arms and load of the excavator. The TCC consists of three chambers, including chamber with piston rod, chamber without piston rod and counterweight chamber. The counterweight chamber is connected to an accumulator, which provides average load force. The chamber with piston rod and the chamber without piston rod are connected to inlet and outlet of a variable pump respectively, constituting a pump controlled system together. The mathematical models of load, engine, pump, TCC and accumulator were established in this study. According to the mathematical model, the dynamic response was simulated and the dynamic characteristics of each components were analyzed. The parameter matching of accumulator was proposed as well. Besides, the simulation model was built and the simulation result was carried out. From the simulation, the dissipated energy of each cylinder was obtained and compared with the dissipated energy without potential energy recovery system. According to the comparison, the potential energy recovery system can reduce the dissipated energy of variable pumps by around 30∼60%, and reduce the dissipated energy of engine by around 50%.

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