Aspects of the Energy Consumption of a Digital Hydraulic Power Management System Supplying a Digital and Proportional Valve Controlled Multi Actuator System

2014 ◽  
Author(s):  
Matti Karvonen ◽  
Mikko Heikkilä ◽  
Seppo Tikkanen ◽  
Matti Linjama ◽  
Kalevi Huhtala
Keyword(s):  
Energy Consumption ◽  
Power Management ◽  
Management System ◽  
Control Method ◽  
Inverse Kinematic ◽  
Hydraulic Power ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Power Management System

Hydraulic motion control is traditionally done with servo or proportional valves. A digital hydraulic valve is based on arrays of simple on/off valves. Independent metering control is possible with digital valves since control notches are not linked together. With commonly used commercial proportional valves constant opening ratios are used. In this paper, a small mobile boom is studied. The lift and tilt cylinders can be controlled with proportional or digital valves. Closed loop control system is based on a robust control method of a multi actuator boom and also inverse kinematic equations are required in coordinate drive. The supply system consists of a Digital Hydraulic Power Management System (DHPMS) which is capable of supplying separate supply pressures for both actuator supply lines. Measurements are done, and one vs. two supply pressures and digital vs. proportional valves are compared. Two different test trajectories and two different load masses are used. Analysis focuses on the energy consumption of different test cases and sources of losses are inspected. Results show that energy consumption can be reduced up to 44%.

Variable speed digital hydraulic transformer–based servo drive

2019 ◽  
Vol 234 (3) ◽  
pp. 287-298
Author(s):  
Matti Linjama
Keyword(s):  
Power Management ◽  
Management System ◽  
Peak Power ◽  
Average Power ◽  
Variable Speed ◽  
Servo Drive ◽  
Hydraulic Power ◽  
Hydraulic Servo ◽  
Power Management System ◽  
Hydraulic Accumulator

This article studies a digital hydraulic servo drive driven by a variable speed electric servomotor. Digital displacement control is implemented by using a two-port digital hydraulic power management system having six pistons and 18 on/off control valves. The first port of the digital hydraulic power management system controls the cylinder speed, while the second port is connected to a hydraulic accumulator. The peak power is taken from the accumulator, and the electric servomotor supplies only the average power into the system. An experimentally validated simulation model is used, and the results show a combination of adequate controllability and excellent energy efficiency. The estimated reduction in the size of the electric motor is 57%.

The Fuzzy Rule Based the BDFM Torque Control

2012 ◽  
Vol 203 ◽  
pp. 226-230
Author(s):  
Peng Chen ◽  
Jian Yang Zhai ◽  
Zheng Zhu
Keyword(s):  
Closed Loop ◽  
Control Method ◽  
Direct Torque Control ◽  
Fuzzy Rule ◽  
Torque Control ◽  
Closed Loop Control ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Doubly Fed

Combining with some fuzzy of the direct torque control and the fuzzy control which is often used in the traditional AC motor control,we put forward a direct torque control theory based on the fuzzy rule. The brushless doubly-fed machine(BDFM) closed-loop control system with the direct torque control based on the fuzzy rule is simulated by using of the Matlab/Simulink software, and the simulation results show that the closed-loop control method is correct and effective.

scholarly journals Perturbation Observer-Based Robust Control Using a Multiple Sliding Surfaces for Nonlinear Systems with Influences of Matched and Unmatched Uncertainties

Mathematics ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1371 ◽  
Author(s):  
Ha Le Nhu Ngoc Thanh ◽  
Mai The Vu ◽  
Nguyen Xuan Mung ◽  
Ngoc Phi Nguyen ◽  
Nguyen Thanh Phuong
Keyword(s):  
Robust Control ◽  
Control Method ◽  
Lyapunov Theory ◽  
Loop Control ◽  
Single Input Single Output ◽  
Single Output ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Unmatched Uncertainties ◽  
Matched And Unmatched Uncertainties

This paper presents a lumped perturbation observer-based robust control method using an extended multiple sliding surface for a system with matched and unmatched uncertainties. The fundamental methodology is to apply the multiple surfaces to approximate the unknown lumped perturbations simultaneously influencing on a nonlinear single input–single output (SISO) system. Subsequently, a robust controller, based on the proposed multi-surface and the approximated values, is designed to highly improve the control performance of the system. A general stability of the lumped perturbation observer and closed-loop control system is obtained through the Lyapunov theory. Results of a numerical simulation of an illustrative example demonstrate the soundness of the proposed algorithm.

The Direct Torque Control Research of Permanent Magnet Linear Synchronous Motor

2011 ◽  
Vol 143-144 ◽  
pp. 350-354
Author(s):  
Jun Zhu ◽  
Xu Dong Wang ◽  
Bao Yu Xu ◽  
Hai Chao Feng
Keyword(s):  
Simulation Experiment ◽  
Control Method ◽  
Dynamic Performance ◽  
Direct Torque Control ◽  
Torque Control ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Hysteresis Controller ◽  
Control Research ◽  
Loop Control System

In order to improve the dynamic servo performance of PMLSM, a classical direct torque control (DTC) scheme based on bang-bang control is proposed in the paper. The proposed control method uses the bang-bang hysteresis controller formed a dual-closed loop control system, it contains torque loop and flux loop. The DTC control model was established and the simulation experiment was made. The simulation experiment results show that the DTC can improve the dynamic performance of PMLSM. It can reduce the ripples of speed and torque, so that it can provide more precision and accuracy servo performance.

Design of Intelligent Green Power Management System

2013 ◽  
Vol 340 ◽  
pp. 984-987
Author(s):  
Yong Sheng Du ◽  
Zhang Hong Yu ◽  
Yu Qing Jian
Keyword(s):  
Energy Consumption ◽  
Power Management ◽  
Management System ◽  
Electricity Consumption ◽  
Electrical Equipment ◽  
Control Center ◽  
Green Power ◽  
Power Management System ◽  
Intelligent Power Management ◽  
And Control

Intelligent power management system can detect and control the electricity consumption of electrical equipment of family and office automatically, to achieve the purpose of saving energy consumption. The monitoring server is the control center of the whole system,it can real-time monitor the energy consumption data of inserting the electric apparatus,and it can also control the power on and off automatically through remote operation of the client or using strategies. The monitoring server uses embedded Linux platform based on arm architecture,software development mainly uses C Language. This paper introduces the software design of monitoring server, and also in detail describes the design of the driver and communication protocol.

Comparison of Proportional Control and Displacement Control Using Digital Hydraulic Power Management System

2014 ◽  
Author(s):  
Mikko Heikkilä ◽  
Matti Karvonen ◽  
Matti Linjama ◽  
Seppo Tikkanen ◽  
Kalevi Huhtala
Keyword(s):  
Power Management ◽  
Management System ◽  
Low Flow ◽  
Energy Losses ◽  
Hydraulic Systems ◽  
Displacement Control ◽  
Hydraulic Power ◽  
Proportional Control ◽  
System Pressure ◽  
Power Management System

The Digital Hydraulic Power Management System (DHPMS) is a solution based on the digital pump-motor technology and has shown to be a promising approach to improve the energy efficiency of hydraulic systems. The DHPMS is controlled by active on/off valves, but unlike the digital pump-motors the DHPMS has multiple independent outlets; hence, the DHPMS can operate also as a transformer. In this experimental study, a proportional control of a mobile boom is compared with a displacement control when a six-piston DHPMS is used. In the proportional control, the system pressure is controlled by the DHPMS and a lift cylinder with a proportional valve. In the displacement control, the cylinder fluid volumes are controlled directly using the DHPMS. Firstly, the systems under study are presented along with the control methods. Then the control performance of the DHPMS is studied and finally, the energy losses in the systems are analysed. The results show the versatility of the DHPMS; it is capable of fast and accurate pressure control but also handles the direct flow control. According to the measurements, the losses are significantly smaller in the displacement controlled system thanks to the minimised throttling losses and the energy recovery. Nevertheless, the energy losses in the prototype DHPMS are rather high due to the leakage in the control valves and their low flow capacity, and therefore improvements in the design are needed.

scholarly journals Adaptive Barrier Control for Nonlinear Servomechanisms with Friction Compensation

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Shubo Wang ◽  
Haisheng Yu ◽  
Xuehui Gao ◽  
Na Wang
Keyword(s):  
Control Method ◽  
Design Procedure ◽  
Lyapunov Stability Theory ◽  
Friction Compensation ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Full State ◽  
Loop Control System ◽  
The Stability ◽  
The Given

This paper proposes an adaptive barrier controller for servomechanisms with friction compensation. A modified LuGre model is used to capture friction dynamics of servomechanisms. This model is incorporated into an augmented neural network (NN) to account for the unknown nonlinearities. Moreover, a barrier Lyapunov function (BLF) is utilized to each step in a backstepping design procedure. Then, a novel adaptive control method is well suggested to ensure that the full-state constraints are within the given boundary. The stability of the closed-loop control system is proved using Lyapunov stability theory. Comparative experiments on a turntable servomechanism confirm the effectiveness of the devised control method.

Double Closed-Loop Control System of Bi-Direction Current Source Inverter

2011 ◽  
Vol 204-210 ◽  
pp. 699-703
Author(s):  
Wei Kang ◽  
Li Xia Zhang ◽  
Zhen Lei
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Control Method ◽  
Current Source ◽  
Battery Pack ◽  
Closed Loop Control ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Coordinate Conversion

The double closed-loop control system of current source SPWM inverter (CSI) is designed to meet the need of battery pack testing system. The battery pack has tiny inner resistance, back electromotive force and it acted as a comparative load which made the control system hard to design. The control system aimed at the specialty of the battery pack load and put forward a loop-locked control method based on dq coordinate conversion of CSI. Typical I and II control system is adopted to get a better performance. It increases the transform efficiency by SPWM and gets high power factor and high dynamic response quality by dq coordinate conversion. Simulations and tests proved the correctness and feasibility of the control system.

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