Modeling and Analysis of the Pressure Shock Characteristics of a Load-sensitive Hydraulic System Jointly Controlled by Pump and Valve

Liu, Yiou; Lai, Qiwei; Zhang, Runlin; Wang, Nei

doi:10.1088/1755-1315/631/1/012081

Cited by 2 publications

(2 citation statements)

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“…In terms of optimizing the structure of the variable mechanism of load sensitive pumps, some scholars have studied the inherent characteristics of load sensitive pumps. Liu et al 9 focused on the pressure shock characteristics of load sensitive pumps and studied the impact of pressure shock characteristics under different load conditions. More attempts have been devoted to investigating the mapping relationship between the structural parameters of the variable mechanism and load sensitive control characteristics.…”

Section: Introductionmentioning

confidence: 99%

Load sensitive control characteristics of a novel two-dimensional pulse width modulated variable mechanism

Jian,

Yan

2024

Advances in Mechanical Engineering

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Load sensing technology is a typical hydraulic technology that automatically meets load requirements by adjusting the pressure and flow at the pump outlet. Traditional load sensitive pump control systems rely on variable mechanisms to achieve such flow control characteristics. However, general variable mechanisms have complex structures and poor dynamic performance if frequently adjusted. Therefore, a new variable mechanism, named two-dimensional pulse width modulation rotary valve, is proposed. Different from the pulse width modulation control method of the electronic technology, the two-dimensional pulse width modulation rotary valve conducts secondary distribution of the quantitative pump output in the way of fluid pulse width modulation: the valve core rotates to generate discrete fluid, and the axial sliding of the valve core controls the duty ratio of the discrete fluid. The dynamic balancing of the axial displacement is controlled by feedback pressure to provide a fixed differential pressure for the control valve, achieving that the flow through the control valve is uniquely controlled by the valve opening of the control valve. The principle of the fluid pulse width modulation is first introduced, and then the mathematical model of the proposed variable mechanism and the corresponding system is established. Simulation analysis is implemented. Finally, the effectiveness of the load sensing system controlled by a two-dimensional pulse width modulation rotary valve is verified by the experiment.

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Section: Introductionmentioning

confidence: 99%

Load sensitive control characteristics of a novel two-dimensional pulse width modulated variable mechanism

Jian,

Yan

2024

Advances in Mechanical Engineering

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“…With the rapid development of intelligent equipment, it is necessary to deploy various sensors in the system to monitor its dynamic parameters in real-time, and link actions through closed-loop feedback so that the equipment can work automatically. Specifically, the pressure and flow of the hydraulic system are both important links to be monitored in the closed-loop system [1][2][3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Influence of different testing positions of sensors on the dynamic response of load sensing hydraulic systems

Liu

Wang²

2023

J. Phys.: Conf. Ser.

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This paper first introduced the load sensing hydraulic system and elaborated on its load feedback, pressure cut-off, and constant power control principles. Moreover, based on the response hysteresis of the load sensing hydraulic system in the actual commissioning of the project, this paper proposed the possible influence of the sensor on the response of the hydraulic system through troubleshooting analysis. Third, experiments were conducted to obtain the system dynamic response curves given different sensor positions and to prove the hypothesis. Meanwhile, the influence mechanism and improvement measures were analyzed. Finally, the optimal installation positions of the sensor based on different operating conditions were discussed.

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Modeling and Analysis of the Pressure Shock Characteristics of a Load-sensitive Hydraulic System Jointly Controlled by Pump and Valve

Cited by 2 publications

References 0 publications

Load sensitive control characteristics of a novel two-dimensional pulse width modulated variable mechanism

Load sensitive control characteristics of a novel two-dimensional pulse width modulated variable mechanism

Influence of different testing positions of sensors on the dynamic response of load sensing hydraulic systems

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