Abstract
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.
Highlights
The high ratio of power to weight is an important feature of hydraulic systems
fluid power converter (FPC) PARAMETER DESIGN According to the above analysis, factors such as the Pulse width modulation (PWM) signal period, the mass of the inertial mass module, and the cross-sectional area of the conversion cylinder have an important impact on the performance of FPC
When the weight of the FPC is required to be small in some cases, it is necessary to increase the value of 4Smax/π D2 in order to make the mass m of the inertial mass less
Summary
The high ratio of power to weight is an important feature of hydraulic systems. With the pursuit of higher drive performance, hydraulic systems with more compact, lighter weight and higher energy efficiency have bright application prospects in mobile hydraulic robots and industrial hydraulic systems [1], [2]. A flywheel and a hydraulic motor form the inertial component, the high frequency switch valve can be controlled by the PWM signal to adjust the output pressure [9], [20]. The DC transformer can control output voltage through PWM technology with low power consumption, as shown in Fig.. In FPC, the inertial mass corresponds to the inductance component, the accumulator corresponds to the capacity component, and the high-speed on-off valve is used to switch the conversion state. When the high-speed on-off valve is closed, the inertia of motion will cause the inertial mass and the piston rod to continue to slide, the hydraulic oil is squeezed from the conversion cylinder to the load port, and the stored kinetic energy release and re-converted into hydraulic energy. The output of the new FPC can be controlled by changing the duty cycle k
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