scholarly journals Research on variable pressure characteristics of step variable hydraulic hybrid system based on cartridge value group

2019 ◽  
Vol 2019 (13) ◽  
pp. 415-420
Author(s):  
Chunshuang Li ◽  
Xin Wang ◽  
Jiayi Wang ◽  
Li Wang ◽  
Xinhui Liu
Keyword(s):  
Hybrid System ◽  
Variable Pressure ◽  
Hydraulic Hybrid ◽  
Pressure Characteristics

scholarly journals Technical Solutions of Forest Machine Hybridization

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2793
Author(s):  
Václav Mergl ◽  
Zdravko Pandur ◽  
Jan Klepárník ◽  
Hrvoje Kopseak ◽  
Marin Bačić ◽  
...  
Keyword(s):  
Hybrid System ◽  
Technological Development ◽  
New Technology ◽  
Storage Device ◽  
Hydraulic Motor ◽  
Hybrid Propulsion ◽  
Hydraulic Hybrid ◽  
Drive Systems ◽  
Hydraulic Accumulator ◽  
Technical Solutions

The paper deals with the characteristics of three different types of power train hybridization of forest logging machines and with the benefits of reducing environmental impacts by comparing new technology with more conventional, older technology. New hybridization options that could be implemented in forestry machines are also discussed. The paper divides a hybrid solution into three classes based on the energy used in the system of hybridization. First is an electro-hybrid system that uses an electric motor and battery or different storage device. The second, a hydraulic hybrid system, is a solution with a hydraulic accumulator, hydraulic motor, and pump. The third system is a combination of the electro-hybrid and hydraulic-hybrid system. The current technical and technological development of hybrid drive systems, as well as their components, has led to significant improvements in drive performance and thus better performance of the new generation of forest vehicles. Improved energy efficiency using hybrid propulsion systems in forest vehicles would result in a significant reduction in greenhouse gas emissions and possibly lower maintenance costs.

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.

Modeling, Simulation and Design Optimization of a Series Hydraulic Hybrid Vehicle

2014 ◽  
Vol 541-542 ◽  
pp. 727-731 ◽  
Author(s):  
R. Ramakrishnan ◽  
Somashekhar S. Hiremath ◽  
M. Singaperumal
Keyword(s):  
Energy Efficiency ◽  
Design Optimization ◽  
Hybrid System ◽  
Energy Efficient ◽  
Major Influence ◽  
Prime Mover ◽  
Manufacturing Companies ◽  
Efficient System ◽  
Construction Machinery ◽  
Hydraulic Hybrid

Crude oil resources in the world continue to diminish; automobile, agricultural machinery and construction machinery manufacturing companies are placing more emphasis on energy efficient series hydraulic hybrid systems which can replace their conventional transmission systems. Series hydraulic hybrid system is a mechatronics system with two source of power (that includes prime mover and hydro-pneumatic accumulator) which drives the vehicle. Even though, it has been proven as an energy efficient system, sizing of the components or sub-system for automobiles has got a major influence on energy efficiency of vehicle. In this paper, a power bond graph approach is used to model the dynamics of series hydraulic hybrid system and simulation results elucidate various modes of operations. It also shows the dynamic response of hydro-pneumatic accumulator, prime-mover and system output speed. Further, design optimization of system is carried out to optimize the physical /process parameters for the maximum system's output energy that, leads to increase in energy efficiency and environmental friendly vehicle.

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