Performance analysis of a new energy-efficient variable supply pressure electro-hydraulic motion control method

Du, Chenglong; Plummer, Andrew; Johnston, D N

doi:10.1016/j.conengprac.2017.01.002

Cited by 33 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where c is an adjustable positive factor. Differentiating V and noting equations (22), (24), (26), and (28) yields…”

Section: Resultsmentioning

confidence: 99%

“…In [23], the control law of VSPC can also be deduced by assuming the desired spool position. In addition, a load-prediction-based VSPC controller was developed for a hydraulic actuated robot so as to enhance the energy saving capability of the system [24]. In our previous studies, two kinds of VSPC, which combined with the disturbance observer and state observer, were also proposed [25,26].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Energy-Efficient Robust Control for Direct Drive and Energy Recuperation Hydraulic Servo System

Wei-ping

Zhao

2020

Complexity

View full text Add to dashboard Cite

During the vertical cyclic actuation process of heavy materials handling, the gravitational potential energy will be converted to heat in the form of throttle in the traditional hydraulic system. Therefore, large energy dissipation is inevitable is this process. In order to achieve energy recuperation, as well as precise trajectory tracking, a direct drive and energy recuperation system is developed. To be specific, the function of direct drive and energy recovery is realized via the three-chamber actuator and a hydraulic accumulator. Moreover, the optimized parameters are obtained by the simulated annealing algorithm. To further reduce the energy consumption, the variable supply pressure control circuit is introduced into the system. Furthermore, the prescribed tracking performance is guaranteed by the proposed robust controller. To compensate for the uncertainties, both in the variable supply pressure control circuit and the robust controller, the RBF neural network is employed to approximate the unknown function. The presented approach theoretically possesses the ability to minimize the energy consumption while maintaining satisfied tracking accuracy. The results demonstrate that the proposed approach can save nearly 90 percent of the energy, and the maximum tracking error is 2 mm.

show abstract

“…where c is an adjustable positive factor. Differentiating V and noting equations (22), (24), (26), and (28) yields…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Robust Control for Direct Drive and Energy Recuperation Hydraulic Servo System

Wei-ping

Zhao

2020

Complexity

View full text Add to dashboard Cite

show abstract

“…The loss of damping, which arises in a pump-controlled system 12–22,24–26 either in absence of the SODCV or for keeping the SODCV wide open, could make the actuation prone to undesired oscillations. This could get enhanced in a VDP by passive feedback of pressures to the compensator from the main line through pilot lines.…”

Section: Literature Reviewmentioning

confidence: 99%

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

Hati¹,

Mandal

Sanyal

2020

Proceedings of the Institution of Mechanical Engineers, Part I:

View full text Add to dashboard Cite

Losses in control valves drag down the average overall efficiency of electrohydraulic systems to only about 22% from nearly 75% for standard pump-motor sets. For achieving higher energy efficiency in slower systems, direct pump control replacing fast-response valve control is being put in place through variable-speed motors. Despite the promise of a quicker response, displacement control of pumps has seen slower progress for exhibiting undesired oscillation with respect to the demand in some situations. Hence, a mechatronic simulation-based design is taken up here for a variable-displacement pump–controlled system directly feeding a double-acting single-rod cylinder. The most significant innovation centers on designing an axial-piston pump with an electrohydraulic compensator for bi-directional swashing. An accumulator is conceived to handle the flow difference in the two sides across the load piston. A solenoid-driven sequence valve with P control is proposed for charging the accumulator along with setting its initial gas pressure by a feedforward design. Simple proportional–integral–derivative control of the compensator valve is considered in this exploratory study. Appropriate setting of the gains and critical sizing of the compensator has been obtained through a detailed parametric study aiming low integral absolute error. A notable finding of the simulation is the achievement of the concurrent minimum integral absolute error of 3.8 mm s and the maximum energy saving of 516 kJ with respect to a fixed-displacement pump. This is predicted for the combination of the circumferential port width of 2 mm for the compensator valve and the radial clearance of 40 µm between each compensator cylinder and the paired piston.

show abstract

“…Based on electrohydraulic flow matching (EFM) system, Xu et al has tried adopting dynamic pressure feedback 30 and hybrid displacement/pressure control. 31 Du et al 32 regulate the target of supply pressure according to the valve property and gravitational load of a manipulator driven by a servo system. However, impacts of motion state have not been taken into consideration in these studies.…”

Section: Introductionmentioning

confidence: 99%

Efficient pump and meter-out control for electrohydraulic system with time-varying negative load

Mengren

Wang

2018

Proceedings of the Institution of Mechanical Engineers, Part I:

View full text Add to dashboard Cite

In hydraulic systems under negative loads, counterbalance valves are widely employed, which introduce instability and sizable energy consumption. This article focuses on the electrohydraulic system with meter-out orifice and variable pump, which allows flexible control structure. The target is to reduce inlet pressure level as well as diminish oscillation caused by time-varying loads. An extended load observer is constructed to estimate the external load. Accordingly, a robust back-stepping controller with integral part and disturbance compensation is proposed to regulate the meter-out orifice, achieving velocity-oriented control. Also, a model-based pressure-oriented controller is developed to determine pump displacement. The target is set to 3 bar in this work, while the pressure losses in conventional systems are more than 12 bar. The stabilities of these two independent controllers are both proved by Lyapunov theory. Experiments focusing on energy consumption, load compensation, and velocity tracking are carried out verifying the controller effectiveness. Discussions of results illustrate that the whole proposed controller succeeds in velocity tracking and reducing energy consumption in the presence of time-varying negative load.

show abstract

Performance analysis of a new energy-efficient variable supply pressure electro-hydraulic motion control method

Cited by 33 publications

References 4 publications

Energy-Efficient Robust Control for Direct Drive and Energy Recuperation Hydraulic Servo System

Energy-Efficient Robust Control for Direct Drive and Energy Recuperation Hydraulic Servo System

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

Efficient pump and meter-out control for electrohydraulic system with time-varying negative load

Contact Info

Product

Resources

About