Load Sensing Fluid Power Systems

Aoki, Y.; Uehara, Kiyoji; Hirose, Kazuyuki; Karakama, Tadao; Morita, Kouichi; Akiyama, Teruo; Oda, Yosuke

doi:10.4271/941714

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…In this paper a 4 pilot pressure signals compensator is introduced (Figure 3). It has the same features of the previous version [11] but with the additional characteristic of "Flow Sharing" [12]. In fact, this compensator, regardless of the loads, always guarantees flow to all actuators, ensuring their motions.…”

Section: Signals Pressure Control Compensatormentioning

confidence: 99%

Experimental and Modelling Analysis of a Downstream Compensation System: Energy Optimization of the Directional Control Valves

Bonavolonta

Frosina

Marani³

et al. 2023

TJFP

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Through a study on the Fluid Power innovations in the last years emerged that still few solutions have been successfully implemented for the optimization of the hydraulic circuits. The recent machine electrification offers a potential for investment in energy-saving hydraulic systems to ensure greater performance and higher battery autonomy. From different studies emerged that in the specific field of ICE Off-road Vehicles, only about 10–15% of the available power at fuel level is actually transformed into useful energy for the actuators. Particularly the losses in the Directional Control Valves represent about 35–40% of the hydraulic energy available at the pump level. The traditional Directional Control Valves design solutions, in fact, neglects important opportunities for reducing losses and improving internal regeneration. Especially, energy recovery is rarely applied and in any case by means of important superstructures which considerably increase the costs of the system. This paper presents a new hydraulic architecture: an original Directional Control Valve layout based on a Downstream Compensation approach. In particular, a Flow Sharing system is implemented in this new architecture with the goal to minimize the wasted energy. In fact, this system realizes an important energy recovery from both the inertial loads and the simultaneous use of multiple actuators at different pressure level. The circuit enables recovered energy to be stored in a high-pressure accumulator. The paper presents the simulation results and the energy saving estimation realized through a lumped parameter environment “Amesim Simcenter”. Additionally, the results of experimental activities show the innovative system performance, benefits and physical applicability. This idea is based on concrete objectives and pays particular attention to cost sustainability, industrial manufacturability and system scalability.

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Section: Signals Pressure Control Compensatormentioning

confidence: 99%

Experimental and Modelling Analysis of a Downstream Compensation System: Energy Optimization of the Directional Control Valves

Bonavolonta

Frosina

Marani³

et al. 2023

TJFP

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“…The loads of actuator are often time-variant and 1. electric motor; 2. variable displacement pump; 3. valve group unit; 4. hydraulic cylinder as the PVG series multi-way valve produced by Danfoss and M4 series multi-way valve produced by Bosch Rexroth. However, the load-sensing system based on above compensation principle has the disadvantages of slow control response and unstable speed regulation in terms of dynamic characteristics [12]. With the rapid development of electronic transducer technology, in the 1990s, western universities such as RWTH Aachen University began to study the electronic-hydraulic load-sensing system using electrical signals to replace mechanical and hydraulic signals earlier [13].…”

Section: System Principlementioning

confidence: 99%

Simulation Analysis of Characteristics for Independent Metering Control System Based on Downstream Compensation

Zhang¹,

Xu²,

Yang³

et al. 2019

WJET

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Aiming at the shortcomings of the separate meter in and separate meter out hydraulic system, a new type of independent metering control system is proposed by referring to the principle of load-sensing system. The valve group unit in the system is designed, and the AMESim/Matlab cosimulation model of the component and system is established. The actuator speed control, energy consumption and anti-flow saturation characteristics of the system are discussed. The simulation result shows that the system proposed in this article can achieve better performances.

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Recent applications and designs of fluid power control systems in Japan

Nakano

1995

Current Advances in Mechanical Design and Production VI

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Load Sensing Fluid Power Systems

Cited by 7 publications

References 7 publications

Experimental and Modelling Analysis of a Downstream Compensation System: Energy Optimization of the Directional Control Valves

Experimental and Modelling Analysis of a Downstream Compensation System: Energy Optimization of the Directional Control Valves

Simulation Analysis of Characteristics for Independent Metering Control System Based on Downstream Compensation

Recent applications and designs of fluid power control systems in Japan

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