A new type of hydraulic cylinder system controlled by the new-type hydraulic transformer

Shen, Wei; Jiang, Jihai; Su, Xiaoyu; Karimi, Hamid Reza

doi:10.1177/0954406213515646

Cited by 15 publications

(11 citation statements)

References 19 publications

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“…22 have proposed one new-type hydraulic transformer which is composed of two main parts that are a swash plate-type pump and a part is similar to a swing vane motor. 22 In addition, there are other methods, such as electric-hydraulic hybrid energy recovery methods, 23 load sensitive technology, 24 double-pump or multi-pump matching different load force of actuators, technology of independent metering valve ports, 25,26 etc. To a certain extent, these methods could improve the efficiency of the multi-actuator hydraulic system.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of a new kind of hydraulic cylinder for mobile robots

Yang

Shang

Xie

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to improve the efficiency of multi-actuator mobile robots hydraulic system, this paper proposes a new kind of cylinder whose effective area is variable. The new cylinder has multi chambers which can be connected with each other or to a main system circuit by controlling switching valves. On the one hand, the new cylinder can make sure that the load pressure of all actuators is almost equal through varying effective area. On the other hand, the new cylinder can realize the flow recovery through that return chambers are connected with feeding chambers. Therefore, the new cylinder can reduce overall machine energy consumption by reducing throttling losses and allowing energy recovery. The performance of the new cylinder is analyzed through building the mathematical model. Based on the evaluated results, in order to further improve the performance of the load match of the cylinder and avoid the deflection of the main piston, the structure of the cylinder is optimized. Finally, an optimized cylinder is shown in this paper which has well performance of the load match.

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Section: Introductionmentioning

confidence: 99%

Design and optimization of a new kind of hydraulic cylinder for mobile robots

Yang

Shang

Xie

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…However, this HT is manually controlled and it is difficult to meet the automatic requirements. Then, Wei Shen proposed a new type of HT, which is integrated with a swing vane motor to control the angular displacement of the port plate directly [23]. DHT is a digital hydraulic transformer, the device has a number of working oil chambers with different cross-sectional areas, and each working chamber is controlled by a two-position three-way valve.…”

Section: A Development Status Of Hydraulic Transformermentioning

confidence: 99%

On the Design of Energy-Saving Fluid Power Converter

Yang

Shang

et al. 2020

IEEE Access

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The high energy efficiency and lightweight are recent trends in mobile hydraulics. In this paper, a new energy-saving fluid power converter (FPC) is designed to solve the problem of low energy conversion efficiency in hydraulic systems with variable load. The FPC is a kind of hydraulic transformer, it is similar to the DC transformer in working principle. Pulse width modulation (PWM) signal is used to control the high-speed on-off valves, and the high-speed on-off valve can switch supply ports between different pressure oil sources to achieve the adjustment of the FPC's output. The FPC's mathematical principle is analyzed in this paper, the influence of the friction between the inertial mass and the conversion cylinder on the system efficiency is studied. The influence of the PWM signal frequency, conversion cylinder cross-sectional area and inertial mass on the characteristics of FPC system is deduced. The results of the analysis are validated by Matlab/Simulink, and suggestions of selecting the design parameters of FPC are provided.

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“…The common pressure rail (CPR) system in combination with the hydraulic transformer (HT) is a new type of hydraulic energy–saving system, which decouples the supply side from the actuators, allowing optimal engine operation independent of the current power demand, and it has a wide application prospect in engineering machinery, automobile and test equipment. 1–4…”

Section: Introductionmentioning

confidence: 99%

“…The common pressure rail (CPR) system in combination with the hydraulic transformer (HT) is a new type of hydraulic energy-saving system, which decouples the supply side from the actuators, allowing optimal engine operation independent of the current power demand, and it has a wide application prospect in engineering machinery, automobile and test equipment. [1][2][3][4] The HT is the core component when it works with the CPR system. It absorbs the necessary hydraulic power and delivers this power at the required pressure and flow, similar to an electric transformer that transforms voltage and current.…”

Section: Introductionmentioning

confidence: 99%

Pressure characteristics of a novel double rotor hydraulic transformer

Jiang

Liu

2019

Proceedings of the Institution of Mechanical Engineers, Part I:

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The hydraulic transformer is the core component when it works with the common pressure rail system, which integrates the functions of the pump and the motor, and thus possesses sensitive pressure characteristics. The rotating speed has significant influence on the pressure characteristics of a hydraulic transformer while it has not been considered previously. In this study, aimed at improving the working performance, a novel double rotor hydraulic transformer is proposed and a comprehensive mathematical model considering the dynamic characteristics of the cylinder block is established. At the same time, a prototype is made and the experiment is conducted. The test results show that the robust rotor structure enables a larger pressure range, and the numerical results exhibit a good match with the test results. The parameter sensitivity study shows that the delivery pressure is mainly subject to the valve plate control angle δ and, under the effects of the resistance torques, pressure loss will occur especially under a large control angle and a high rotating speed. The magnitude of the instantaneous angular velocity fluctuation increases sharply when the speed is lower than 400 r/min, which is the main reason for the serious pressure pulsation at a low speed. As a result of the improved low-speed stability and output flow uniformity, the pressure pulsation rate of the double rotor hydraulic transformer is greatly reduced. However, the pulsation rate is still high at an extremely low speed. In addition, when the rotating speed exceeds the capability of the damping grooves, the pressure undershoot becomes serious at the A-T transition region around the control angle of −30°. Consequently, from the perspective of pressure characteristics, the limitation on the rotating speed under small control angles is suggested for the design of the double rotor hydraulic transformer controller.

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A new type of hydraulic cylinder system controlled by the new-type hydraulic transformer

Cited by 15 publications

References 19 publications

Design and optimization of a new kind of hydraulic cylinder for mobile robots

Design and optimization of a new kind of hydraulic cylinder for mobile robots

On the Design of Energy-Saving Fluid Power Converter

Pressure characteristics of a novel double rotor hydraulic transformer

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