Journal ArticleDOI
An Energy-Saving Pressure-Compensated Hydraulic System With Electrical Approach
Wang Tao,Qingfeng Wang +1 more
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TLDR
In this article, the compensator is designed as a regeneration device consisting of a hydraulic motor and an electric generator, where hydraulic energy can be regenerated and pressure compensation function is realized by adapting the electromagnetic torque of the generator to the load as well.Abstract:
Mobile hydraulic systems are developed toward better control performance and higher energy efficiency. Pressure compensators, which govern the pressure drops over the control orifices, are widely used in multiactuator systems to improve their operability. However, additional energy is also dissipated in the compensators especially under the overrunning load conditions. This paper presents a novel energy-saving system, where the compensator is designed as a regeneration device consisting of a hydraulic motor and an electric generator. Then, hydraulic energy can be regenerated and pressure compensation function is realized by adapting the electromagnetic torque of the generator to the load as well. The close-loop control of the generator is designed by effective pressure drop estimation. The proposed energy-saving system and controller are implemented on an experimental platform of hybrid excavators which is equipped with an electric energy storage device. The experimental results show both good control performance and significant energy-saving effect.read more
Citations
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Journal ArticleDOI
A Review on Energy-Saving Optimization Methods for Robotic and Automatic Systems
TL;DR: This review paper classifies and analyses several methodologies and technologies that have been developed with the aim of providing a reference of existing methods, techniques and technologies for enhancing the energy performance of industrial robotic and mechatronic systems.
Journal ArticleDOI
Hamiltonian modeling of multi-hydro-turbine governing systems with sharing common penstock and dynamic analyses under shock load
TL;DR: In this article, the authors proposed a universal dynamic mathematical model of the multi-hydro-turbine governing system, which is fitted into the theoretical framework of the generalized Hamiltonian system, utilizing the method of orthogonal decomposition.
Journal ArticleDOI
Development of Pump and Valves Combined Hydraulic System for Both High Tracking Precision and High Energy Efficiency
Litong Lyu,Zheng Chen,Bin Yao +2 more
TL;DR: A kind of novel pump and valve combined electro-hydraulic system is developed that is able to realize the same high level of tracking precision as the valve control method, but consumes about 35%–47% less of energy.
Journal ArticleDOI
A comprehensive overview of hybrid construction machinery
TL;DR: In this paper, the authors reviewed the state-of-the-art for the hybrid wheel loader and excavator, which focuses on powertrain configuration, energy storage devices, and energy management strategies.
Journal ArticleDOI
Efficiency analysis and evaluation of energy-saving pressure-compensated circuit for hybrid hydraulic excavator
Tao Wang,Tao Wang,Qingfeng Wang +2 more
TL;DR: In this paper, a hydraulic cylinder driven scheme combining a pressure compensator and an energy recovery device together has been proposed to achieve good control operation and energy saving capability simultaneously, and its efficiency characteristics are further investigated in order to provide analytical and experimental references to practical applications.
References
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Journal ArticleDOI
Adaptive robust motion control of single-rod hydraulic actuators: theory and experiments
TL;DR: In this paper, a discontinuous projection-based adaptive robust controller (ARC) is proposed for the swing motion control of a single-rod hydraulic actuator with constant unknown inertia load, which takes into account not only the effect of parameter variations coming from the inertia load and various hydraulic parameters, but also the effects of hard to model nonlinearities such as uncompensated friction forces and external disturbances.
Journal ArticleDOI
Modeling and Robust Discrete-Time Sliding-Mode Control Design for a Fluid Power Electrohydraulic Actuator (EHA) System
Yang Lin,Yang Shi,Richard Burton +2 more
TL;DR: In this paper, a robust discrete-time sliding-mode control (DT-SMC) for a high precision electro-hydraulic actuator (EHA) system is proposed to characterize the frictions as an uncertainty in the system matrices.
Journal ArticleDOI
Research on the energy regeneration systems for hybrid hydraulic excavators
TL;DR: In this article, a hybrid hydraulic excavator (HHE) was considered and two energy regeneration systems were considered, and the control strategy and parameter matching for the proposed energy regeneration system (ERS) were discussed.
Journal ArticleDOI
Coordinate Control of Energy Saving Programmable Valves
TL;DR: A two-level coordinated control scheme is proposed: the task-level configures the valve usage for maximal energy saving and the valve-level utilizes adaptive robust control (ARC) technique to guarantee the closed-loop system stability and performance under various model uncertainties and disturbances.
Journal ArticleDOI
An Investigation of Swash Plate Control Concepts for Displacement Controlled Actuators
TL;DR: In this article, it is shown that electro-hydraulic pump control allows sufficiently high dynamics for this class of heavy duty actuators, which can in fact compete with conventional valve controlled systems.
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