Analysis of and Experimental Research on a Hydraulic Traction System Based on a Digital Hydraulic Transformer

Author:

Li Weijian,Zhang Zhuxin,Liu Tao,Cao Hengyi,Ni Tao,Wang Yafei

Abstract

In this study, we designed a new type of digital hydraulic transformer using four gear–pump/motor units with a displacement ratio of 20:21:22:23 and two control valve groups that consist of four solenoid directional valves. The driving gear shafts of the four gear–pump/motor units are fixedly connected to achieve synchronous rotation. The two control valve groups are respectively installed through an integrated valve block on the inlet and outlet of each gear–pump/motor unit. With the objective of reducing the installed power and energy consumption of hydraulic traction systems, we propose a new energy-saving hydraulic system based on a digital hydraulic transformer. This hydraulic system uses a digital hydraulic transformer as a pressure/flow control element. By controlling the power on/off states of eight solenoid directional valves, the digital hydraulic transformer can realize a change in output flow and then a change in speed of the hydraulic cylinder piston rod. Through the theoretical derivation and simulation analysis of the hydraulic system pressure/flow change process, and the experimental verification of the built hydraulic traction system based on the experimental platform, a conclusion is drawn that the proposed digital hydraulic transformer can change the output pressure/flow of a hydraulic system through a binary digital control, verifying the feasibility of the pressure change principle of the designed digital hydraulic transformer and the rationality of the hydraulic traction system circuit.

Funder

the Key Research and Development Program of Hebei Province; the Key Research and Development Program of Hebei Province; the National Key Research and Development Program of China

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

Reference25 articles.

1. Review of the Energy Saving Hydraulic System Based on Common Pressure Rail

2. Speed tracking control for hydraulic transformer system based on active regulating common pressure rail

3. Development and research status of hydraulic transformer in the hydraulic system;Jiang;J. Chang’an Univ.,2016

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