Abstract
A high-speed on/off valve (HSV) is generally the core component of a digital hydraulic transmission system. Therefore, its dynamic characteristics often restrict the overall performance of the digital hydraulic system. Most of the current studies focus on the optimization on the dynamic characteristics or the energy characteristics, few studies have comprehensively considered the two characteristics of the valve together. In this paper, a pre-existing control algorithm (PECA) is proposed to improve the dynamic characteristics of the HSV, and simultaneously optimize the power losses of the HSV to improve its energy conversion efficiency. The results show that, compared with the traditional single-voltage driven strategy, the opening time of the PECA decreases by 29.4%, the closing time decreases by 59.6%, and the energy conversion rate increases by 7.9%.
Highlights
A high-speed on/off valve (HSV) is widely used in hydraulic transmission control systems because of its fast response, small size and strong antipollution ability, especially in high frequency hydraulic control systems [1,2,3]
The traditional single-voltage driven strategy uses a 24 V voltage square wave to drive the HSV, and pre-existing control algorithm (PECA) is divided into five stages, and a multivoltage phase strategy is used to drive the HSV
Experimental Results and Analysis Due to the power losses dissipating into the air in the form of heat, the value of power losses directly measured in experiment is not accurate enough to be used for analysis
Summary
A HSV is widely used in hydraulic transmission control systems because of its fast response, small size and strong antipollution ability, especially in high frequency hydraulic control systems [1,2,3]. With the decrease in driving current, the opening response characteristics of the HSV becomes worse, but the power loss ratio decreases, and the energy efficiency of the HSV is improved These studies explored the relationship between the valve’s electrical parameters and power losses, considering the dynamic characteristics in detail. When the failing edge of the control signal occurs, the Q2 and Q3 are opened and the Q1 and Q4 are closed; the HSV is loaded with negative voltage and the current of the coil will drop to 0 rapidly, as will the electromagnetic force. Where U is the excitation voltage of the coil, I is the coil current, R is the coil resistance, ψ is the coil flux, L is the coil inductance, N is the number of coil turns
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