Study on the effect of switching inertance hydraulic system on energy regeneration efficiency due to difference in valve switching time and piping configuration.

Abstract

The energy efficiency of the conventional flow control of hydraulic systems using the pressure loss of throttle valves, which are widely used in construction machinery, is very low. If the switching inertance hydraulic system which is a kind of PWM control hydraulic system is used, a significant improvement in energy regeneration efficiency can be expected. In this study, we first show a modeling and calculation method for understanding the effects of differences in valve switching time and pipeline configuration near the valve. We also confirm that the accuracy of the model is good and experimentally show that PWM control hydraulic system can regenerate energy to the high pressure source. Next, we examine the effect of the energy regeneration efficiency of PWM control hydraulic system due to the differences in valve switching time and pipeline configuration near the valve using the previous model. As a result, we confirm that when a relatively long pipeline is added near the valve, waste of kinetic energy and reduction of natural frequency affect the energy regeneration efficiency and average flow rate.

Keywords

• hydraulic system
• pwm control
• energy regeneration
• switching valve
• fluid elasiticity