Study Of Control Strategy Of Hydraulic Secondary Regulation Driving System

Secondary Regulation is a kind of hydrostatic driving technique, which has the ability to realize energy and regeneration with one or several pressure-coupled executive components working in a constant pressure network. It adapts to changes of the external load by adjusting the inclination of the slant plate of a secondary component. Therefore, not only does it possess fairly well dynamic and static characteristics, but also in some conditions, the secondary component can serve as a pump to recover kinetic energy or gravity potential energy It undoubtedly has expansive application foreground in nowadays. However, the secondary regulation technology still remains many problems in theories and applications to be discovered. The thesis is from a project of Northeastern University, the design and production of hydraulic experimental bench. In this thesis, taking a secondary regulation experiment table as the concrete object, the secondary regulation technology is studied in deep and width.After consulting numerous data home and aboard, firstly, the development of secondary regulation technique is surveyed. Secondly, the domination principle of secondary regulation technique is introduced in full. Then, the development and application status of secondary regulation is surveyed with its problems at present pointed out. Finally, the research direction of this thesis is determined.Firstly, the composition and the principle of operation of the secondary regulation experiment table is introduced in the thesis. The request which controls in view of the experimental system computer, the computer control system hardware platform and the software design method is elaborated in detail, the correspondence of the electrical PLC control and the computer are studied, the digital PID controller is designed. According to test needs, the method of auto-drawing is studied.After the mathematical model of the equipment is established, static performance and dynamic performance of the secondary regulated velocity system is analyzed. The figure of thesystem's Bode proves the system is steady. The velocity control system is lower in response speed, which led to the system's frequency width is narrow.. Finally, the main drawback of the velocity control system is slow in response speed, the Proportional controller, the Proportional Integral controller and the PID controller is designed. The following embarks from the system state space;the condition feedback control and quadrics optimum controls are studied. According to the time-variable characteristic of the system parameters, the dynamic robust compensation controller is studied.