Auto-calibration based control for independent metering of hydraulic actuators

Opdenbosch, Patrick; Sadegh, Nader; Book, Wayne J.; Enes, Aaron R.

doi:10.1109/icra.2011.5980472

Cited by 15 publications

(10 citation statements)

References 10 publications

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“…After the manufacturing process for these valves, a deviation in performance can be noticed which affect the IM system overall and to overcome this a calibration algorithm can be used [85]. A novel auto-calibration statetrajectory control method for IM uses a four poppet valve configuration or a Wheatstone bridge [18]. Inserting electronics and sensors to IM valves improves the controllability and overall system performance.…”

Section: Im Valvesmentioning

confidence: 99%

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A review of electrohydraulic independent metering technology

et al. 2020

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The subject of this paper is the review of advanced technology used in hydraulic systems. The technology in question is termed Independent Metering (IM); this is used in hydraulically driven mobile machinery, such as agricultural, construction, municipal, and forestry vehicles. The idea behind the concept is to modify the connection between the actuator, which could be a cylinder or a motor, and a flow control valve. Traditionally, spool hydraulic valves were used to control the fluid flow into and out of hydraulic actuators. This keeps the meter-in and the meter-out of the actuator mechanically connected due to the construction of these valves. This connection makes the control system blind to pressure changes in one of the hydraulic chambers in the actuator. This, in turn, reduces the overall system controllability. It also increases energy losses, especially under an overrunning load. These two main weaknesses led researchers to break this mechanical connection and get into a new technology with different characteristics. The proposed technology was called Independent Metering. New and more complex control techniques can now be applied to the hydraulic systems using this technology that were not possible before or could be applied to more conventional servo design. This paper reviews Independent Metering (IM) and the technologies used or developed in this field to date. The paper reviews the state of art hydraulic technologies and indicates the links between them and IM. It also reviews the different types of hydraulic valves used when implementing IM. This review also discusses some control algorithms, IM layouts, IM challenges, and identifies where further improvements may be achieved.

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Section: Im Valvesmentioning

confidence: 99%

“…It is termed by programmable because it changes the control system from the hydro-mechanical concept into an intelligent control system that relies on software. Breaking the mechanical connection leads to many advantages and disadvantages as concluded from [16,17,18].…”

Section: Introductionmentioning

confidence: 99%

A review of electrohydraulic independent metering technology

et al. 2020

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“…Patrick et al [13] proposed a new control method of automatic calibration state trajectory, and applied it to the flow rate control in independent metering system. The system uses five electric hydraulic lifting valves to form the independent metering control structure.…”

Section: Flow-rate Regulation Mechanism Of Inlet/outlet Independent Mmentioning

confidence: 99%

Review on Inlet/Outlet Oil Coordinated Control for Electro-Hydraulic Power Mechanism under Sustained Negative Load

Liu

Dong

2018

Applied Sciences

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Speed control and smooth regulation in an electro-hydraulic motion control system under negative load (over-running load) are crucial to mobile machineries, vehicles, and motion simulation equipment. Problems, such as bad natural stability, bad dynamic performance for small adjusting signal, serious coupling, and difficulty to coordinate between speed smoothness and speed regulation, exist in traditional valve-controlled and pump-controlled electro-hydraulic power mechanism. The coordinated motion control scheme, which is based on independent regulation of inlet/outlet oil for electro-hydraulic power mechanism has attracted the attention of many scholars. In the last two decades, many progresses had been made in coordinated control technology, employing in inlet/outlet independent metering and pump/valves independent regulation. Moreover, the technology has been widely used in the electro-hydraulic operating system in hydraulic excavator and the speed smoothness control system in heavy transport vehicles. In this study, recent advancements and upcoming trends in coordinated control and inlet/outlet independent metering for electro-hydraulic power mechanism under sustained negative load are reviewed. Firstly, related research advancements are summarized, including flow rate regulation mechanism based on inlet/outlet coordinated control, coordinated control strategy and nonlinear control method of electro-hydraulic control system. Then, nonlinear modeling of inlet/outlet independent metering and pump/valves independent regulation in electro-hydraulic control system is presented. In addition, the electro-hydraulic speed smoothness control and energy recovery for heavy engineering vehicles under long down-slope is discussed and reviewed. Finally, existing problems and future trends of inlet/outlet coordinated control for an electro-hydraulic power mechanism under sustained negative load are presented.

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“…Possible solutions to replace the traditional 4/3 directional controlled valve used in hydraulic systems to control the motion of an actuator include: (1) Displacement control actuation [11,12], (2) independent metering control [13,14], and (3) digital hydraulics [15][16][17][18]. Each of these solutions has its own strengths and weaknesses.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Design of a Poppet Valve by Transitory Simulation

et al. 2019

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This article contains the results and analysis of the dynamic behavior of a poppet valve through CFD simulation. A computational model based on the finite volume method was developed to characterize the flow at the interior of the valve while it is moving. The model was validated using published data from the valve manufacturer. This data was in accordance with the experimental model. The model was used to predict the behavior of the device as it is operated at high frequencies. Non-dimensional parameters for generalizing and analyzing the effects of the properties of the fluid were used. It was found that it is possible to enhance the dynamic behavior of the valve by altering the viscosity of the working fluid. Finally, using the generated model, the influence of the angle of the poppet was analyzed. It was found that angle has a minimal effect on pressure. However, flow forces increase as angle decreases. Therefore, reducing poppet angle is undesirable because it increases power requirements for valve actuation.

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Auto-calibration based control for independent metering of hydraulic actuators

Cited by 15 publications

References 10 publications

A review of electrohydraulic independent metering technology

A review of electrohydraulic independent metering technology

Review on Inlet/Outlet Oil Coordinated Control for Electro-Hydraulic Power Mechanism under Sustained Negative Load

Analysis of the Design of a Poppet Valve by Transitory Simulation

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