The Research On Dynamic Performance And Signal Processing Based On Novel Hydraulic Self-spinning High Speed On/Off Valve

In the current hydraulic control system, as control component.high-speed on/off valve is usually working in states of on/off.which widely used in industrial control. The chracteristics of high speed valve are high control accuracy.fast response time, small energy losses and conveniently provide digital interface.The performance of high speed on/off valve determine the hydraulic system’s stability, high efficiency and fast response. Due to the characteristics of high speed on/off valve, big flow is contradicted to the fast response, the main research at domestic and aboard are focused on the contradiction. The majority of hydraulic systems are controlled using a metering valve or the use of variable displacement pumps. Meteringvalve control is compact and has a high control bandwidth, but it is energy inefficient due to throttling losses. Variable displacement pumps are far more efficient as the pump only produces the required flow, but comes with the cost of additional bulk, sluggish response, and added cost. Therefore, in order to solve the above problems, the paper propose a novel self-spinning high speed on/off valve.Because of the rotary motion is actuated by scavenging energy from the fluid flow directly, the novel self-spinning high speed on/off valve isn’t need additional driver.As the spool rotates, the helical barriers selectively channel the flow to the application (on) or to tank (off). The duty ratio is determined by the axial position of the spool relative to the rhombus inlet nozzle on the sleeve. The axial position of the spool is actuated by hydro-statically using a small gerotor pump that is hydraulically connected to both ends of the valve sleeve. By pumping fluid from one end of the sleeve to the other end, the spool axial position is varied. In order to achieved precise control and fast reponse of axial position, the thesis introduced fuzzy-logic parameter self-tuning PID controller on the basis of PID control algorithm which based on PID control algorithm and Fuzzy control and established the simulation model. After comparative experiment have accomplished between the parameter fuzzy-logic parameter self-tuning PID control and the conventional PID control.The Matlab/Simulink experimental results demonstrate the designed controller improves the system response speed the characteristics of DC motor control system.Both axial and rotary sensing are achieved using non contact methods according to the model of novel self-spinning high speed valve, so rotary motion introduces a periodic measurement noise and process noise. The paper is presented a improved kalman filter algorithm on the basis of researching several kalman filter algorithm. This improved algorithm is used to filtering spool axial position control and estimating rotation state of spool. At last, the spool axial position controll and rotation state estimation kalman filter model is established, and Matlab/Simulink to simulation results are verified the effectiveness of kalman filtering algorithm.