Compound control method of speed and position of hydraulic cylinder system based on displacement feedback
A composite control and system speed technology, applied in the direction of fluid pressure actuation device, servo motor, mechanical equipment, etc., can solve the problems of large energy loss, heat generation, and inability to realize the positioning system of the hydraulic system, so as to reduce the control time, reducing the cost of use, increasing the effect of ride comfort
Inactive Publication Date: 2012-07-11
TONGJI UNIV
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Problems solved by technology
A common solution is to set a low-speed section to force the hydraulic cylinder to decelerate before reaching the predetermined position, and run slowly to the target stroke at a low speed. The loss is large, and it is easy to cause problems such as heating
Another solution is to adopt speed closed-loop control, and set a travel switch to realize positioning control, but this method is only applicable to the system with fixed position control, and it cannot be realized for the system that needs to realize positioning at any position in the whole stroke.
Moreover, this method requires the installation of both a speed sensor and a position control signal generator, which will increase the complexity of the system and the cost of operation and maintenance.
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[0040] Such as figure 1 As shown, the valve-controlled cylinder system includes a pump source, a proportional valve, a hydraulic cylinder, a displacement sensor, a controller, and a load sensing circuit. The flow rate of the proportional valve is only related to the opening area of the proportional valve. The controller receives the set displacement value signal from the upper computer, and compares it with the actual displacement signal fed back by the displacement sensor. Such as figure 2 As shown in the flow chart, when the difference Δy has not reached the set threshold ε, the controller outputs the rated current of the proportional valve, and the hydraulic piston moves rapidly; when the difference Δy reaches the set threshold ε, the control The device converts the displacement difference Δy into a speed signal v through a sine function with an exponent; since the pressure difference on both sides of the proportional valve is constant, the flowing flow is only related...
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The invention relates to a compound control method of a speed and a position of a hydraulic cylinder system based on displacement feedback, which comprises the following steps: 1) a displacement sensor transmits an acquired actual displacement value y1 of a hydraulic cylinder piston to a controller, 2) the controller compares the actual displacement value y1 of the hydraulic cylinder with a set displacement value y0 to obtain a displacement deviation absolute value of deltay, and judges whether the displacement deviation absolute value of deltay is smaller than the set threshold, if so, executing the step 3), if not, executing the step 4), 3) the current output by the controller is rated current of a proportional valve, namely the proportional valve is totally opened, the flow through the proportional valve is maximal, and the hydraulic cylinder piston quickly moves, and 4) the controller converts the displacement deviation absolute value of deltay into an output current i according to a preset relation function, and controls the proportional valve through the output current i so as to realize fast control for the speed following the displacement. The compound control method, disclosed by the invention, has the advantages of shorter control time, lower realization cost and the like in comparison with the prior art.
Description
technical field [0001] The invention relates to a speed-position compound control method of a hydraulic system, in particular to a displacement feedback-based speed-position compound control method of a hydraulic cylinder system. Background technique [0002] In engineering, valve-controlled cylinders are widely used to control the displacement of hydraulic cylinder pistons. The general method is to use a displacement sensor to detect the displacement of the hydraulic cylinder piston, and compare the displacement feedback signal with the expected position signal to obtain the position deviation, thereby controlling the proportional valve or servo valve to realize the displacement control of the hydraulic cylinder. This common displacement feedback control method can only realize the control of the displacement of the piston, but cannot control the change of the speed during the process of the displacement of the piston. The opening control of the proportional valve or the se...
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IPC IPC(8): F15B15/28F15B11/04
Inventor 李晶誾耀保黄帅
Owner TONGJI UNIV
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