Comparison of Linear Controllers for a Hydraulic Servo System

Andersen, Torben Ole; Hansen, Michael Rygaard; Pedersen, Henrik C.; Conrad, Finn

doi:10.5739/isfp.2005.449

Cited by 8 publications

(6 citation statements)

References 2 publications

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“…Andersen et al proposed a forklift with the power system of a battery-EM-hydraulic pump. The test results showed that the energy regeneration efficiency could be up to 40% [17,18]. The efficiency of PERS was increased by 18% in the low speed mode and 30% in the high speed mode.…”

Section: Introductionmentioning

confidence: 99%

Potential Energy Recovery System for Electric Heavy Forklift Based on Double Hydraulic Motor-Generators

Chen

Ren

et al. 2020

Applied Sciences

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Heavy forklifts that are widely used in ports and stations have large gravitational potential energy at the lowering of the boom. As concerning the large rated power level, the engine is still the main power source for the heavy forklifts. With the increasingly stringent emissions regulations, the electric heavy forklift becomes an important choice. The structure and the working mode of an electric heavy forklift are introduced. Additionally the schematic of double hydraulic motor-generators is adopted to regenerate the potential energy when the boom is descending. The judge rule of the working mode and control strategy are analyzed. A test rig of a prototype electric heavy forklift is established. Control mode discrimination of potential energy regeneration, the control performance and the influence factors on regeneration efficiency are tested based on the test rig. The experimental results show that the discrimination method of the working mode of the proposed double hydraulic motor-generators with a potential energy regeneration system for potential energy is feasible. The descending of the lifting cylinder is consistent with the handle. The forklift can obtain the good following ability. Although the lifting cylinder descends at low velocity, the velocity is stable and the fluctuation of the rodless chamber pressure is within 0.1 MPa. With the increase of the load mass and descending velocity, the regeneration efficiency increases accordingly. The maximum efficiency is up to 74%. Hence, the proposed potential energy regeneration system is feasible and potential energy regeneration system does not affect the control performance of the boom.

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Section: Introductionmentioning

confidence: 99%

Potential Energy Recovery System for Electric Heavy Forklift Based on Double Hydraulic Motor-Generators

Chen

Ren

et al. 2020

Applied Sciences

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“…Active damping of hydraulic systems based on pressure feedback has been around for decades [13]. It is also used in mobile machine structures, large-inertia load device movement, hydraulic servo controller design, hydro-dynamic control, and energy-saving active dampers [14][15][16][17][18]. The method of designing outlet throttle holes considering system dampness is also involved [19,20].…”

Section: Introductionmentioning

confidence: 99%

A Vibration Reduction Control Method for Tractor Rear Hydraulic Hitch Based on Pressure Feedback

Liu¹,

Du³

et al. 2023

Agriculture

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Tractors transporting heavy hitches tend to tilt severely, resulting in significant dynamic loads on the front axle and affecting handling stability. Tractors and rear hitches can be considered vibration systems with two coupled masses. Thus, active damping control strategies between tractors and rear hitches are proposed in this study. The complexity and versatility of tractor hydraulic hitching during tractor transit transport are considered. A method of improving the tractor hydraulic hitch damping ratio with pressure feedback is proposed. The dynamic characteristics of the pressure feedback hydraulic hitch system are analyzed. A dynamic model of the tractor transfer transport unit is established, and a numerical simulation is carried out to verify the effectiveness of the proposed hydraulic hitch vibration reduction control strategy based on pressure feedback. A real test platform for tractor vibration reduction control is built. The test results show that the pressure feedback vibration reduction control method proposed in this paper affects tractor pitching motion suppression. In addition, the proposed control strategy does not require a force pin sensor. Tractor hydraulic hitch damping control costs are reduced. The vibration reduction control strategy proposed in this study has high reliability and can be used as a reference for non-road-vehicle vibration reduction control.

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“…In recent years, research efforts have been directed toward meeting these requirements. Most of these studies have been based on the linear control theory [2][3][4][5]. However, in such works, some important dynamic information may be lost when the hydraulic servo system is linearized around some operating point during the design.…”

Section: Introductionmentioning

confidence: 99%

Automation of a Hybrid Control for Electrohydraulic Servo-Actuators with Residual Dynamics

2022

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In this paper, a hybrid position/force controller for electrohydraulic servo-actuators is designed in the presence of residual dynamics. The purpose is to apply a cycle of movement that is mostly used in industrial fatigue test applications, which consists in imposing a specified force on a flexible load after a movement to some position. This cycle can be repeated several times with different magnitudes and frequencies of force and position trajectories. Some damages could occur at switching times, especially in the presence of some residual dynamics. To avoid any damages at switching times, a force trajectory generator is designed. Then, our contribution defines a method to automatically generate the switching signal in order to commute between two controllers with any abrupt change of state. To show the effectiveness of the proposed approach, several simulation tests are carried out on the electrohydraulic system.

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Comparison of Linear Controllers for a Hydraulic Servo System

Cited by 8 publications

References 2 publications

Potential Energy Recovery System for Electric Heavy Forklift Based on Double Hydraulic Motor-Generators

Potential Energy Recovery System for Electric Heavy Forklift Based on Double Hydraulic Motor-Generators

A Vibration Reduction Control Method for Tractor Rear Hydraulic Hitch Based on Pressure Feedback

Automation of a Hybrid Control for Electrohydraulic Servo-Actuators with Residual Dynamics

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