Control Method of Symmetrical and Unequal Negative Superposition Proportional Valve-Controlled Asymmetrical Cylinder System
A technology of asymmetric cylinder and control method, which is applied to fluid pressure actuation system components, fluid pressure actuation system testing, servo motor components, etc. The effect of eliminating steady-state errors
Active Publication Date: 2022-04-15
CHANGSHA AERONAUTICAL VACATIONAL AND TECHNICAL COLLEGE
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Problems solved by technology
[0004] However, the current research is mainly aimed at electro-hydraulic proportional valves with positive superimposition, and the flow dead zone caused by positive superposition is directly subtracted in the control. The pressure of the two chambers of the hydraulic cylinder and the change of the oil temperature, there are few studies on the zero point of the proportional valve control asymmetric cylinder system with negative superimposition
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[0040] A control method for a symmetrical and uneven negative superimposed proportional valve-controlled asymmetric cylinder system, the schematic diagram of the proportional valve-controlled asymmetric cylinder system of the symmetrical and uneven negative superimposed proportional valve-controlled asymmetric cylinder system (hereinafter referred to as the system) See details figure 1 , where: p S is the oil supply pressure of the hydraulic cylinder of the proportional valve, p R is the return oil pressure, p 1 is the pressure of the rodless cavity of the hydraulic cylinder, p 2 is the pressure of the rod chamber of the hydraulic cylinder, q 1 is the flow rate of the rodless chamber of the hydraulic cylinder, q 2 is the flow rate of the rod chamber of the hydraulic cylinder, x V is the displacement of the proportional spool, y is the displacement of the hydraulic rod, and F is the external load of the hydraulic cylinder.
[0041] Assuming that the valve is a symmetrical...
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The present invention provides a control method for a symmetrical and uneven negative superposition ratio valve-controlled asymmetric cylinder system, which includes the following steps: obtaining an input signal of a symmetrical and uneven negative superposition ratio valve-controlled asymmetric cylinder system based on model transformation; Compensate the input signal to obtain the compensated input signal, specifically: obtain the input signal of the system at zero speed state; obtain a symmetrical and uneven negative overlapping proportional valve-controlled asymmetric cylinder system based on the input signal at zero speed state Compensation signal; Combining the input signal and the compensation signal to obtain the compensated input signal. Applying the technical scheme of the present invention, the theoretical zero point model of the valve-controlled asymmetric cylinder system with symmetric, uneven, and negative superposition is deduced, and a zero-point online compensation control method is proposed on the basis of the model transformation control of the valve-controlled asymmetric cylinder system, so that the valve-controlled The response of the asymmetric cylinder system is symmetrical, and the steady-state error caused by the zero point offset is eliminated, and the control accuracy of the proportional valve-controlled asymmetric cylinder system is effectively improved.
Description
technical field [0001] The invention relates to the technical field of mechanics and electronics, in particular to a control method for a symmetrical and uneven negative overlapping proportional valve-controlled asymmetrical cylinder system. Background technique [0002] Electrohydraulic servo system has a wide range of applications in real life. The proportional valve changes the flow area of the orifice through the relative movement of the valve sleeve and the valve core, and controls the pressure and flow of the liquid flow. The pre-opening forms of the valve sleeve and spool can be divided into three types: negative opening (positive overlap), zero opening (zero overlap) and positive opening (negative overlap). , the zero-speed equilibrium point of the proportional valve-controlled hydraulic cylinder system is generally not at the zero position of the proportional valve, which leads to a large steady-state error in the system adopting the control strategy commonly use...
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IPC IPC(8): F15B13/02F15B19/00F15B21/08
CPCF15B13/02F15B19/00F15B21/087F15B21/08
Inventor 曾乐李红章刘金荣许文斌杨俊谭建平
Owner CHANGSHA AERONAUTICAL VACATIONAL AND TECHNICAL COLLEGE