Study Of The Digital Control Variable Axial Piston Pump And Its SCM Control

The digitization is one of important development direction of modern hydraulic. It takes some advantages of modern hydraulic, such as energy-saving, flexible-control and improving automation of the hydraulic system. With the great progress of computer technology, the aspect of hydraulic components is turned from simulation components to digital ones and the digitization is main stream of the modern hydraulic gradually.At present, digital variable displacement axial piston pump has some problems. Therefore, on the base of previous work, improvement is brought about and digital variable displacement axial piston pump controlled by SCM and driven by step motor is brought forward in the subject. On the background of market, cheaper SCM is as control core, which cuts down research cost greatly and is convenient for being produced and extended by middle and little scale corporation.The current situation of research and application for digital components at home and abroad is summarized in the paper. The work theory of digital pump is introduced simply. The principle of step motor controlled by SCM and the design of the software and hardware are discussed. Moreover, the methods of SCM controlling step motor are enriched. The structure of digital axial piston pump is designed and the system control model of the pump is set up. Furthermore, the dynamic simulation of the pump by MATLAB is acquired and its results add up to the need satisfactorily, which validates the feasibility of the system work principle of the digital axial piston pump from the theory and the structure design is reasonable.The double edge slide valve which is simple structure and facility application is applied to Variable adjust framework designed in the subject, which predigests the structure of variable adjust framework greatly and advances capabilities of digital pump so that digital variable piston pump controlled accurately is gotten if variable frameworkand SCM system are fitted on the general simulative axis piston pump.The effect of the structure and performance parameters on system and error analysis are described in the paper, moreover, the factors affecting system dynamic characteristic are obtained and the measures of mending parameters are put up with.Consequently, variable adjust framework designed in the subject possesses some characteristics as follows: simple structure, accurately controlling and low cost, which is capable of meeting the need of market.